Keyboard Latency Test
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Testing...About Input Latency
Input latency is the time from pressing a physical key to seeing the visual feedback on screen. It directly affects gaming responsiveness and control precision.
How It Works
This tool measures system processing latency—the difference between the OS capturing the key event timestamp and the browser JavaScript engine executing the event handler. This reflects system load, browser performance, and input chain efficiency.
Why Jitter Matters
More important than absolute latency is consistency. If latency fluctuates wildly (high jitter), muscle memory becomes difficult to develop, leading to missed inputs. Competitive gaming demands low jitter (standard deviation).
FAQ
Q.Is this testing absolute hardware latency?
Not exactly. Pure Web environments cannot directly read USB hardware-level physical trigger times. This test includes OS and browser processing time, but it reflects your actual perceived "end-to-end" input experience.
Q.What values are considered normal?
On modern browsers and Windows systems, average latency of 5ms-15ms is typically considered excellent. Over 30ms may feel sluggish in fast-paced games.
Q.How can I reduce latency?
1. Use a high polling rate keyboard (1000Hz+); 2. Disable V-Sync; 3. Ensure CPU load isn't too high; 4. Use wired connection instead of Bluetooth.
Latency Chain Breakdown
Input Chain Analysis
- Physical Contact: Switch actuation time (Silver/Optical switches are faster).
- MCU Scan: Keyboard controller matrix scanning time (debounce algorithm matters).
- USB Transfer: Higher polling rate = less waiting time to send.
- System/Render: This tool primarily tests this stage. OS scheduling and browser frame render queue.