Keyboard Latency Test - Find and Fix Your Keyboard Input Delay

Not necessarily. Browser-measured latency includes system load, background processes, and browser overhead, not just keyboard hardware. Before concluding the keyboard is the bottleneck, run the test with all background applications closed and your power plan set to High Performance. Many users who initially test at 20 to 30ms drop to 8 to 12ms simply by closing a cloud sync application or browser tab that was consuming CPU scheduler time. If latency remains high after minimising system load, the keyboard hardware or connection type is more likely the actual cause.

Theoretically achievable in hardware tests with the right equipment, yes, as some keyboards at 8000 Hz polling rate produce USB report delays under 0.2ms. In browser-based measurement, consistent sub-1ms results are uncommon because the OS and browser overhead alone typically contribute 1 to 5ms. As for whether it matters, the difference between 1ms and 5ms average latency is imperceptible to any human. The competitive advantage of ultra-low latency keyboards is real but modest, and it only becomes relevant once your gaming setup has already been optimised in every other respect. For most people, the difference between a 1000 Hz wired keyboard at 5ms and an 8000 Hz keyboard at 0.5ms is not something that will affect their play.

Bluetooth HID (Human Interface Device) was designed for general-purpose peripherals with an emphasis on low power consumption rather than low latency. It uses a slotted polling protocol where the device and receiver coordinate communication on fixed time slots, and this architecture introduces 10 to 30ms of latency compared to wired connections, plus more jitter due to radio-frequency factors. If your keyboard supports both Bluetooth and a 2.4GHz USB dongle, switching to the dongle will dramatically reduce this latency, as most gaming-grade 2.4GHz implementations stay within 1 to 5ms of wired performance.

The scan rate is how frequently the keyboard controller reads the key matrix to detect which keys are pressed. The polling rate is how often the keyboard then reports its state to the computer via USB. Both are measured in Hz, and both affect latency but in different ways. A 4000 Hz scan rate means the controller checks for new keypresses 4,000 times per second, which reduces the delay in detecting a physical press. A 1000 Hz polling rate means it reports to the computer 1,000 times per second. For practical input lag, the polling rate matters more for how quickly a detected keypress reaches the OS. Most gaming keyboards now match or exceed their polling rates with their scan rates, but budget keyboards sometimes have high scan rates with lower polling rates, such as 1000 Hz scan and 125 Hz polling, which creates a performance bottleneck. You can verify your actual polling rate at any time with our keyboard polling rate test.

The input latency test measures your total response time, which is the combined time from a visual signal appearing on screen to your click or keypress registering. This includes your biological reaction time, which typically accounts for the vast majority of the result, usually between 150 and 300ms. This keyboard latency test focuses specifically on the hardware and system processing side, measuring how quickly the keyboard event travels from physical press to browser registration. The two tests are complementary, with the keyboard latency test telling you about hardware and system performance, while the input latency test tells you about your total response loop including your own reaction speed. To isolate your biological reaction time directly, our reaction time test removes hardware variables from the equation entirely.

For the best performance, plug directly into a rear motherboard USB port. USB hubs, especially unpowered or older ones, can reduce your keyboard effective polling rate to 125 Hz even if the keyboard is capable of 1000 Hz. Front-panel USB ports on desktop cases are connected to the motherboard through an internal header and sometimes introduce additional latency or polling rate caps depending on the motherboard and case design. If you are getting higher latency than expected, try a different port as the first diagnostic step because it is free, immediate, and resolves a surprisingly large number of cases.

At typical latencies below 30ms, the effect on typing accuracy is minimal for most people. The typing cadence of even fast typists at 80 WPM involves keypress intervals of roughly 150ms, which is far longer than the latency difference between a fast and slow keyboard. Where latency becomes relevant for typists is jitter. If the delay between keypresses and characters appearing on screen is inconsistent, your visual feedback loop breaks down at high speeds, making error detection and correction harder. For competitive typing at 100+ WPM, consistent low-jitter response is more important than absolute low latency. If you want to benchmark your actual typing speed once your system latency is optimised, our typing speed test measures your WPM and accuracy under consistent conditions.

Yes, it is fully free with no account, no sign-up, and no daily limit. Everything runs entirely in your browser and no key event data is ever sent to any server.