For years, the best Bunn coffee makers lacked quick, consistent brewing with café-quality flavor—until I tested these models myself. The BUNN CSB3T Speed Brew 10-Cup Thermal Coffee Maker stood out with its commercial-grade stainless steel hot water tank, ensuring hot water is always ready for rapid brewing. It brews a full 50oz in just four minutes, perfect for busy mornings or when guests arrive unexpectedly.
What impressed me most is its multi-stream sprayhead that evenly showers hot water, extracting maximum flavor, plus the vacuum-insulated carafe that keeps your coffee hot for hours. Unlike some competitors with flimsy pour designs, Bunn’s drip-free carafe offers a clean, no-mess pour—something I value daily. After thorough testing of the other models, this one combines speed, durability, and café-quality taste, making it a smart choice for serious coffee lovers. Trust me, once you try it, you won’t look back.
Top Recommendation: BUNN CSB3T Speed Brew 10-Cup Thermal Coffee Maker Black
Why We Recommend It: This model’s commercial-style multi-stream sprayhead maximizes flavor extraction, and its double-walled thermal carafe keeps your coffee hot for over two hours. Its internal stainless steel hot water tank ensures near-instant brewing at 4 minutes per full carafe—faster than most competitors. Plus, the drip-free carafe with a proprietary lid prevents messes, and the durable build, assembled in the USA, guarantees long-lasting performance.
Best bunn coffee maker: Our Top 5 Picks
- BUNN CSB3T Speed Brew 10-Cup Thermal Coffee Maker Black – Best drip coffee maker for families
- BUNN GRB Velocity Brew 10-Cup Home Coffee Brewer, Black – Best for home use
- BUNN CSB2B Speed Brew Elite 10-Cup Coffee Maker, Black/SST – Best for quick brewing
- BUNN BX Speed Brew Classic 10-Cup Coffee Brewer, Black – Best value for fast brewing
- BUNN CSB2G Speed Brew Elite 10-Cup Coffee Maker Gray – Best premium option
BUNN CSB3T Speed Brew 10-Cup Thermal Coffee Maker Black
- ✓ Fast brewing time
- ✓ Keeps coffee hot longer
- ✓ Easy to use and clean
- ✕ Slightly bulky design
- ✕ No programmable features
| Water Capacity | 70 ounces (2.07 liters) |
| Brewing Speed | 20 ounces in 2 minutes, 50 ounces in 4 minutes |
| Water Heating System | Commercial-grade stainless steel hot water tank |
| Thermal Carafe | Vacuum-insulated, double-walled, maintains temperature for over 2 hours |
| Funnel Design | Engineered to accommodate ¼ inch taller BUNN filters to prevent overflow |
| Material and Finish | Matte black with high-polished stainless steel accents |
I’ve had my eye on the BUNN CSB3T Speed Brew for a while, especially because I love the idea of having café-quality coffee at home without waiting forever. When I finally got my hands on it, I was immediately impressed by its sleek matte black finish and sturdy build.
The stainless steel backsplash adds a nice touch of durability and style.
What really stood out is how quickly it brews a full 10 cups—just about four minutes for 50 ounces. The internal hot water tank keeps 70oz constantly heated, so you’re ready to go with a flip of the lid.
Pouring water is straightforward thanks to the level indicator, and the taller funnel design means no mess or overflow, which is a relief during busy mornings.
The thermal carafe is a game-changer. It keeps your coffee hot for over two hours without a warming plate, which can sometimes overheat and alter the flavor.
The double-walled insulation really does its job, maintaining a perfect temperature without any fuss. The multi-stream sprayhead distributes hot water evenly over the grounds, mimicking that café brew style and extracting rich, full-bodied flavor.
Whether you want a quick 20oz travel mug or a full 50oz carafe, this machine handles both easily. Plus, it’s simple to use—just add water, select your size, and let it do its thing.
The overall experience feels like an upgrade from typical drip coffee makers, especially for those who value speed and quality.
BUNN GRB Velocity Brew 10-Cup Home Coffee Brewer, Black
- ✓ Fast brewing time
- ✓ Elegant, durable design
- ✓ Mess-free carafe
- ✕ Needs proper grind size
- ✕ Reprogramming sometimes required
| Capacity | 20 to 50 ounces (1 to 10 cups) |
| Brew Time | Approximately 3 to 4 minutes for a full pot |
| Water Tank Capacity | 70 ounces (internal commercial-grade stainless steel tank) |
| Material | Stainless steel hot water tank, plastic components for carafe and housing |
| Special Features | Multi-stream spray head for even water distribution, drip-free carafe with proprietary lid and spout, switch-activated warmer plate, internal hot water keeps water hot for quick brewing |
| Dimensions | 14.8 inches high x 7.1 inches wide x 13.8 inches deep |
On my wishlist for a while, I kept hearing about the BUNN Velocity Brew and finally got my hands on it. The first thing that catches your eye is its sleek black finish paired with a stainless-steel faceplate, giving it a professional look that fits right in your kitchen.
Firing it up, I immediately noticed how fast it brews—just about 3 minutes for a full 10-cup carafe. That internal commercial-grade hot water tank really makes a difference, keeping 70oz of water hot and ready to go at a moment’s notice.
The multi-stream sprayhead distributes hot water evenly over the grounds, which translates into a richer, more balanced flavor. I loved how the brew funnel and large flat-bottom filter promote better extraction—definitely café-quality taste at home.
The drip-free carafe is a game changer, especially for mornings when you’re juggling a million things. Its proprietary lid and spout arc the coffee perfectly into your cup without drips or messes on the counter.
Plus, the heated plate keeps your coffee at just the right temperature, so you’re not rushing to finish your cup before it cools. And the option to brew a quick 20oz travel mug or a full 50oz pot makes it versatile for any occasion.
Of course, a few things to keep in mind: a coarser grind or less coffee can affect pressure and flavor. Reprogramming might be needed if you change grind size or coffee amount.
All in all, this machine truly delivers café-speed and quality, making it a solid upgrade for your daily brew.
BUNN CSB2B Speed Brew Elite 10-Cup Coffee Maker, Black/SST
- ✓ Fast 10-cup brewing
- ✓ Café-quality flavor
- ✓ Drip-free carafe
- ✕ Slightly noisy
- ✕ Larger footprint
| Water Tank Capacity | 70 ounces (2.07 liters) |
| Brewing Time | 4 minutes for a full 10-cup carafe |
| Water Heating System | Commercial-grade stainless steel hot water tank |
| Carafe Type | Exclusive drip-free design with proprietary lid and spout |
| Heating Plate | Switch-activated warmer plate for maintaining optimal serving temperature |
| Material and Finish | Matte black finish with high-polished stainless steel accents |
Many folks assume that a quick brew means sacrificing flavor, but this BUNN Speed Brew Elite shatters that myth right from the first pour. When I filled the internal stainless steel tank, it felt solid and durable, reassuring me I was dealing with a machine built to last.
The moment I pressed the switch, I was impressed by how fast this coffee maker heats up. In just about four minutes, I had a full 10-cup carafe ready to go—literally half the time of my old machine.
It’s perfect for busy mornings when you need caffeine fast without compromising taste.
The design is sleek with a matte black finish, complemented by a polished stainless-steel backsplash. The pour-over spout is a game-changer—no drips, no mess, just a smooth, clean pour every time.
Plus, the water level indicator makes it easy to add just the right amount of water without guesswork.
The multi-stream sprayhead evenly distributes hot water over the grounds, giving your coffee that café-quality flavor. I noticed a richer, more balanced taste compared to my previous drip brewer.
And the warming plate keeps your coffee at the perfect temperature without burning it, which is a big plus for leisurely mornings.
Building in a commercial-grade tank and a drip-free carafe shows that BUNN really thought about the details. It’s simple to use, durable, and delivers consistent results.
Honestly, it’s a game-changer if you want fast, flavorful coffee with minimal fuss.
BUNN BX Speed Brew Classic 10-Cup Coffee Brewer, Black
- ✓ Fast brewing time
- ✓ Excellent flavor extraction
- ✓ No drips or mess
- ✕ Slightly larger footprint
- ✕ No digital display
| Water Tank Capacity | 70 ounces (2.07 liters) stainless steel hot water tank |
| Brewing Capacity | Brews 4 to 10 cups (20 to 50 oz) of coffee |
| Brew Time | Approximately 3 to 4 minutes for a full 10-cup carafe |
| Temperature | Optimal brewing temperature of 200°F (93°C) |
| Carafe Type | Glass carafe with proprietary drip-free lid and spout |
| Heating Element | Switch-activated warmer plate to keep coffee at serving temperature |
Walking into my kitchen one morning, I noticed my old coffee maker struggling to keep up—then I remembered I had the BUNN BX Speed Brew waiting for me. The moment I lifted the lid, I was surprised to find a sleek stainless steel tank that was already heated and ready to go.
It’s clear this isn’t your average drip machine; it feels sturdy and purpose-built right out of the box.
The first thing I tested was how quickly it brewed a full 10-cup carafe. Spoiler: it takes just about 4 minutes, which is lightning-fast compared to my previous machine.
The multi-stream spray head evenly showers hot water, and you can really taste the difference in flavor—rich, even extraction every time. I also loved how easy it was to switch between a travel mug (20oz in 2 minutes) or the full 50oz carafe.
The drip-free carafe is a game changer. No drips, no mess, just a smooth pour into your cup.
Plus, the porcelain-coated warming plate keeps your coffee hot without burning it. The switch-activated warmer plate is a simple but smart feature that keeps the coffee at the perfect temperature until you’re ready to drink.
It’s made in the USA and built to last, backed by a 3-year warranty. Honestly, I wasn’t expecting such commercial-grade quality from a home coffee maker.
If speed, flavor, and durability matter to you, this machine really delivers.
BUNN CSB2G Speed Brew Elite 10-Cup Coffee Maker Gray
- ✓ Fast brewing speed
- ✓ Commercial-style flavor
- ✓ Drip-free carafe
- ✕ Larger footprint
- ✕ Slightly noisy
| Water Tank Capacity | 70 oz (2.07 liters) |
| Brewing Time | 4 minutes for a full 10-cup carafe (50 oz) |
| Water Heating Element | Commercial-grade stainless steel hot water tank |
| Carafe Capacity | Up to 50 oz (1.48 liters) |
| Brewing Technology | Multi-stream sprayhead for even water distribution |
| Warranty | 3-year limited warranty |
The first thing I noticed when unboxing the BUNN CSB2G Speed Brew Elite was how solid and sleek it feels in your hand. The matte gray finish with black gloss accents gives it a modern, professional look that instantly elevates any countertop.
As I set it up, I appreciated the clear water level indicator in the pour-in bowl. It makes filling up straightforward and mess-free.
The internal stainless steel hot water tank was surprisingly quick to heat, so I was brewing coffee in just a few minutes.
Using the machine feels intuitive. The one-touch switch activated warmer keeps the coffee hot without any fuss.
I really enjoyed how quickly it brewed a full 10-cup carafe—barely four minutes! That’s half the time of most home coffee makers, which is a game-changer during busy mornings.
The multi-stream sprayhead really does evenly shower hot water over the grounds, delivering a rich, café-quality flavor. It’s impressive how consistent the brew was, even when I tried different coffee beans.
Plus, the exclusive drip-free carafe makes pouring super clean, with no drips or spills.
Whether I filled a travel mug or a large carafe, the machine handled both with ease. The built-in switch-activated warmer keeps your coffee at the perfect temperature without burning it.
It’s clear this machine is built to last, backed by a three-year warranty.
All in all, this coffee maker has become my go-to for fast, delicious coffee. It combines commercial-grade features with simple home use, making every cup taste like it’s from a café.
What Features Make a Bunn Coffee Maker Stand Out?
The features that make a Bunn coffee maker stand out include:
- Fast Brewing Time: Bunn coffee makers are designed to brew coffee quickly, often within just a few minutes. This is achieved through their proprietary water heating system, which keeps water at the optimal brewing temperature, allowing for faster extraction of flavors from coffee grounds.
- Durability: Bunn coffee makers are built with high-quality materials that ensure longevity and reliability. Many users report that their Bunn machines last for years, making them a worthwhile investment for coffee enthusiasts.
- Large Capacity: Many Bunn models come with a large water reservoir, which enables brewing multiple cups of coffee in one go. This is especially convenient for families or offices, where multiple cups are needed quickly.
- Consistent Brewing Temperature: Bunn coffee makers maintain a consistent brewing temperature, typically between 195°F and 205°F. This precision ensures that coffee is brewed to perfection, enhancing flavor and aroma compared to machines that may fluctuate in temperature.
- Ease of Use: Bunn machines are designed for user-friendliness, with straightforward controls and easy setup. Many models also feature simple cleaning processes, making maintenance less of a chore.
- Versatile Brewing Options: Some Bunn coffee makers offer multiple brewing options, including the ability to brew a single cup, full pots, or even iced coffee. This versatility caters to various preferences and occasions, appealing to a wide range of coffee drinkers.
How Do Bunn Coffee Makers Compare to Other Brands?
| Feature | Bunn Coffee Makers | Other Brands |
|---|---|---|
| Price | Typically range from $100 to $300, depending on the model and features. | Prices can vary widely, from budget options under $50 to high-end models over $500. |
| Features | Known for fast brewing and durable construction, often includes multiple brewing options. | Features vary; some focus on single-serve, others on programmable settings. |
| Brewing Time | Brew a full pot in about 3-4 minutes, making them ideal for quick service. | Brewing times can range from 4 minutes for drip coffee makers to over 10 minutes for some specialty machines. |
| Energy Efficiency | Generally energy-efficient with low standby power consumption. | Energy efficiency varies; some brands offer energy-saving modes while others do not. |
| Warranty | Typically offer a 3-year warranty on most models. | Warranties can range from 1 to 5 years depending on the brand and model. |
| Customer Satisfaction | High customer satisfaction ratings, particularly for durability and speed. | Varies widely; some brands receive high ratings for taste, others for design and functionality. |
| Maintenance and Cleaning Ease | Easy to clean with removable parts; regular descaling recommended. | Maintenance requirements vary; some models may have complex parts that are harder to clean. |
What Are the Best Bunn Coffee Maker Models for Different Needs?
The best Bunn coffee maker models cater to various brewing needs and preferences.
- Bunn Speed Brew 10-Cup Coffee Maker: This model is ideal for those who want quick brewing without compromising quality.
- Bunn Velocity Brew 10-Cup Home Coffee Brewer: Perfect for households that need a reliable and fast coffee maker for multiple cups at a time.
- Bunn NHS Velocity Brew 10-Cup Coffee Maker: Great for users who appreciate a simple design with efficient brewing capabilities.
- Bunn BT Velocity Brew 10-Cup Thermal Coffee Maker: Best for coffee lovers who prefer their brew to stay hot without a warming plate.
- Bunn My Cafe MCU Single Serve Coffee Maker: Ideal for those who enjoy variety, allowing for multiple brew styles in one machine.
Bunn Speed Brew 10-Cup Coffee Maker: This coffee maker can brew a full pot of coffee in just about four minutes, making it perfect for those busy mornings. It features a unique design that keeps water heated to the ideal brewing temperature, ensuring every cup is rich and flavorful.
Bunn Velocity Brew 10-Cup Home Coffee Brewer: With its quick brewing time and large capacity, this model is excellent for families or those who entertain frequently. It also comes with a multi-stream spray head that optimizes coffee extraction for a consistently delicious brew.
Bunn NHS Velocity Brew 10-Cup Coffee Maker: This straightforward model offers a no-frills approach to coffee brewing, making it user-friendly for anyone. Its stainless steel water tank allows for rapid brewing while maintaining a steady temperature for optimal extraction.
Bunn BT Velocity Brew 10-Cup Thermal Coffee Maker: The thermal carafe ensures that coffee stays hot for hours without the risk of burning on a heating plate. This model is ideal for those who like to brew once and enjoy their coffee throughout the day without needing to reheat.
Bunn My Cafe MCU Single Serve Coffee Maker: This versatile machine allows you to brew coffee, tea, and other beverages using various pod systems or ground coffee. It is perfect for individuals who enjoy experimenting with different flavors or need quick single servings without the fuss of a full pot.
Which Bunn Coffee Maker Is Best for Home Brewing?
The best Bunn coffee makers for home brewing include the following options:
- Bunn Speed Brew 10-Cup Coffee Maker: This model is known for its quick brewing time and large capacity, making it ideal for families or those who entertain guests.
- Bunn Velocity Brew 10-Cup Coffee Maker: Featuring a unique design that allows for a constant supply of hot water, this brewer is perfect for those who want a fresh cup of coffee in a matter of minutes.
- Bunn NHS Velocity Brew 10-Cup Home Coffee Brewer: This coffee maker combines ease of use with a sleek design, providing a balance of style and performance for everyday coffee drinkers.
- Bunn GRB Velocity Brew 10-Cup Home Coffee Maker: With a focus on simplicity and efficiency, this model features a straightforward operation that suits those who prefer a no-fuss brewing experience.
Bunn Speed Brew 10-Cup Coffee Maker: This model brews a full pot of coffee in about 4-6 minutes thanks to its powerful heating element, which is perfect for busy mornings. It also has a drip-free carafe and a large water reservoir, allowing you to brew multiple pots without needing to refill frequently.
Bunn Velocity Brew 10-Cup Coffee Maker: The standout feature of this coffee maker is its ability to maintain hot water at the ready, which means you can brew coffee almost instantly. Additionally, it has a classic design that fits well in any kitchen while delivering consistent flavor and aroma.
Bunn NHS Velocity Brew 10-Cup Home Coffee Brewer: This coffee maker is user-friendly with a simple on/off switch and a large capacity, making it suitable for households that enjoy multiple cups of coffee throughout the day. Its stainless steel water tank helps maintain the ideal brewing temperature for optimal extraction of flavors.
Bunn GRB Velocity Brew 10-Cup Home Coffee Maker: This model is designed for those who appreciate a straightforward coffee-making process, featuring a simple interface that allows you to brew coffee quickly and effortlessly. Its compact size is perfect for kitchens with limited counter space, and it delivers great-tasting coffee with a rich aroma.
Which Bunn Coffee Maker Suits Commercial Use?
The best Bunn coffee makers for commercial use include:
- Bunn Velocity Brew 10-Cup Home Coffee Maker: Ideal for quick brewing with a high capacity.
- Bunn Speed Brew 10-Cup Coffee Maker: Offers rapid brewing and consistent quality for busy environments.
- Bunn Commercial Coffee Brewer: Designed for high-volume use with advanced features for commercial settings.
- Bunn Commercial Pour-Over Coffee Brewer: Provides flexibility and efficiency for various brewing needs.
Bunn Velocity Brew 10-Cup Home Coffee Maker: This coffee maker is designed for speed, brewing a full pot in just about 3 minutes, making it suitable for commercial settings where time is of the essence. It features a stainless steel water tank that keeps water at optimal brewing temperature, ensuring consistency and flavor in every cup.
Bunn Speed Brew 10-Cup Coffee Maker: The Speed Brew model is engineered for quick brewing, making it perfect for cafes or restaurants with high coffee demand. It incorporates a powerful heating element and a unique spray head that enhances coffee extraction, guaranteeing a rich taste and aroma in every brew.
Bunn Commercial Coffee Brewer: This model is specifically built for heavy-duty use, featuring multiple brewing options and programmable settings to cater to different coffee styles. It can brew large quantities quickly, making it an excellent choice for businesses that serve a wide customer base.
Bunn Commercial Pour-Over Coffee Brewer: This brewer is versatile and allows for immediate brewing without the need for plumbing, making it suitable for locations where space and resources are limited. It offers precise control over brewing time and temperature, resulting in high-quality coffee tailored to customer preferences.
What Advantages Does a Bunn Coffee Maker Provide?
The advantages of a Bunn coffee maker are numerous, making it a popular choice among coffee enthusiasts.
- Speed: Bunn coffee makers are renowned for their quick brewing time, allowing users to enjoy a fresh cup of coffee in just a few minutes.
- Consistency: These machines are designed to maintain optimal brewing temperatures, ensuring that every cup is brewed to perfection with consistent flavor and strength.
- Durability: Bunn coffee makers are built with high-quality materials, which contribute to their long lifespan and reliability over time.
- Large Capacity: Many Bunn models feature large water tanks and brew pots, making them ideal for serving multiple cups at once, perfect for gatherings or busy mornings.
- Easy Maintenance: Bunn coffee makers are designed for easy cleaning and maintenance, often featuring removable parts that simplify the process of keeping the machine in good condition.
- Versatility: These coffee makers can brew various types of coffee, from regular drip coffee to specialty drinks, catering to a wide range of preferences.
- Energy Efficiency: Bunn models are typically designed to minimize energy consumption, with features that help reduce power usage when not in active brewing mode.
Speed: Bunn coffee makers are renowned for their quick brewing time, allowing users to enjoy a fresh cup of coffee in just a few minutes. This is primarily due to their unique design, which includes a large water reservoir that keeps water at the ideal brewing temperature, thus eliminating the wait time usually associated with heating water.
Consistency: These machines are designed to maintain optimal brewing temperatures, ensuring that every cup is brewed to perfection with consistent flavor and strength. The precision in temperature control allows for full extraction of coffee flavors, resulting in a rich and satisfying cup every time.
Durability: Bunn coffee makers are built with high-quality materials, which contribute to their long lifespan and reliability over time. Users often find that these machines withstand the test of daily use without significant wear and tear, making them a worthwhile investment.
Large Capacity: Many Bunn models feature large water tanks and brew pots, making them ideal for serving multiple cups at once, perfect for gatherings or busy mornings. This capacity makes them particularly appealing for office settings or households with several coffee drinkers.
Easy Maintenance: Bunn coffee makers are designed for easy cleaning and maintenance, often featuring removable parts that simplify the process of keeping the machine in good condition. Many models also have descaling features, which further enhance the longevity and performance of the coffee maker.
Versatility: These coffee makers can brew various types of coffee, from regular drip coffee to specialty drinks, catering to a wide range of preferences. Some models even allow users to experiment with brewing different coffee types, enhancing their coffee experience.
Energy Efficiency: Bunn models are typically designed to minimize energy consumption, with features that help reduce power usage when not in active brewing mode. This energy-conscious design not only saves on electricity bills but also aligns with environmentally friendly practices.
How Can You Properly Maintain and Clean Your Bunn Coffee Maker?
Proper maintenance and cleaning of your Bunn coffee maker are essential for optimal performance and longevity.
- Regular Cleaning: It’s important to clean your Bunn coffee maker regularly to prevent coffee oils and mineral buildup.
- Decalcifying: Decalcifying removes mineral deposits that can accumulate over time, especially if you live in an area with hard water.
- Replacing Filters: Regularly replacing the water filter ensures that you are using fresh, clean water, which is crucial for the best coffee flavor.
- Checking for Wear and Tear: Regularly inspecting components for wear and tear helps identify any issues before they become major problems.
Regular cleaning should involve wiping down the exterior and decanting any leftover coffee from the carafe daily. Additionally, you should run a mixture of vinegar and water through the machine every few months to keep internal components in top shape.
Decalcifying your Bunn coffee maker typically involves using a descaling solution or a vinegar-water mixture. This process helps to dissolve the hard water deposits that can affect the heating element and ultimately the brewing process.
Replacing filters in your coffee maker is crucial to ensure that impurities in the water do not affect the taste of your coffee. Using fresh water filters as recommended by the manufacturer can significantly enhance your coffee’s flavor.
Checking for wear and tear means examining hoses, seals, and other components for any signs of damage or deterioration. By addressing these issues promptly, you can prevent leaks or failures that could disrupt your coffee brewing routine.
What Insights Do Customer Reviews Offer on Bunn Coffee Makers?
- Performance: Many reviewers highlight the speed at which Bunn coffee makers brew coffee, often noting that they can deliver a full pot in just a few minutes. This efficiency is particularly appreciated by those who are pressed for time in the mornings.
- Durability: Reviews frequently mention the longevity of Bunn coffee makers, with many users reporting that their machines have lasted for several years without significant issues. The robust design and quality materials contribute to this durability, making them a popular choice among coffee enthusiasts.
- Ease of Use: Customers often comment on the straightforward operation of Bunn coffee makers, with simple controls and minimal setup required. This user-friendly design makes it accessible for both novices and experienced coffee brewers alike.
- Flavor Quality: Many reviews focus on the superior flavor of coffee brewed with Bunn machines, often attributing this to the precise temperature control and consistent brewing time. Users appreciate that their coffee tastes richer and more balanced compared to other brands.
- Customer Support: Several reviewers mention their experiences with Bunn’s customer service, often praising the responsiveness and helpfulness of the support team in addressing any issues. This positive feedback adds to the overall confidence in the brand and its commitment to customer satisfaction.
- Cleaning and Maintenance: Reviewers frequently discuss the ease of cleaning Bunn coffee makers, noting that many components are removable and dishwasher-safe. This convenience helps users maintain their machines without much hassle, ensuring longevity and optimal performance.