Cursor Path Test
Move your cursor in a controlled line or curve to measure tracking variance and sensor jitter. This test captures your actual coordinate stream and quantifies how closely your cursor path matches the ideal line of your physical movement.
- Move your mouse in a slow, straight horizontal line across the test area.
- Observe the plotted path — compare it to a perfectly straight line.
- Check the jitter percentage readout.
- Test at different speeds to understand if jitter is speed-dependent.
High DPI settings amplify sensor noise. If your jitter percentage improves when you switch to lower DPI and raise in-game sensitivity to compensate, your sensor is operating above its optimal native DPI range.
What This Test Measures: Raw Coordinate Deviation
Sensor jitter is the random noise in your mouse's positional output — the difference between where your sensor says the cursor is and where it would be if the sensor were perfect. Every optical sensor produces some jitter, because the CMOS image sensor used to track surface texture has finite resolution and signal-to-noise characteristics that create small random errors in each coordinate sample. You can use a mouse performance checker to access aim training widgets that let you evaluate sensor jitter under actual cursor movement.
This test captures your complete coordinate stream via the browser's pointermove event — the actual X/Y positions your mouse is reporting right now — and calculates the deviation of each point from the mathematically ideal path of your movement. The result, expressed as a jitter percentage, tells you how noisy your sensor's output is. Measured live, directly from your hardware, with no post-processing added by this tool.
How to Read Your Jitter Result
- Below 2% jitter: Excellent. Premium sensor with clean optical output. HERO, PMW-3395, and PAW-3395 class sensors typically land here.
- 2–5% jitter: Good. Normal for mid-range sensors at optimal DPI settings. Imperceptible in gameplay.
- 5–10% jitter: Moderate. May be visible as slight cursor wobble during slow precision movements. Could indicate DPI set above sensor's native resolution.
- Above 10% jitter: High. Likely indicates surface incompatibility, lens contamination, a damaged sensor, or DPI set far above native resolution.
What Causes High Cursor Jitter
- DPI above native sensor resolution: Sensors have a native DPI value (often 800–1600) where they produce the cleanest output. Above this, they use internal interpolation to generate additional counts — introducing artificial jitter. Test at your sensor's native DPI for the cleanest readings.
- Dirty sensor lens: Dust, oils, or scratches on the sensor lens scatter light and reduce the contrast of the surface image, making each frame less reliable for position calculation. Clean the lens with a dry cotton swab.
- Surface incompatibility: Hard glossy surfaces, glass, and solid-color fabrics provide insufficient surface texture for optical sensors. The sensor cannot reliably distinguish consecutive frame positions.
- Very low mouse altitude from pad: If mouse feet are worn very thin, some sensors operate outside their optimal focal height range, degrading image quality.
How to Reduce Cursor Jitter
- Test at different DPI settings — switch to your sensor's native DPI (check manufacturer documentation) and recalibrate in-game sensitivity.
- Clean the sensor lens with a dry lint-free cotton swab. Avoid liquids on the sensor.
- Switch to a cloth or textured hard mouse pad — avoid glossy or glass surfaces.
- Replace worn mouse feet to restore proper sensor lift height.
- Disable sensor smoothing in mouse software — smoothing reduces visible jitter but introduces lag.
Want to understand what your coordinate graphs are telling you visually? Read our guide to interpreting cursor path test results — and learn how to resolve cursor jumping and skipping caused by sensor lens contamination or surface issues.
Jitter is random noise in the sensor's positional output — small random errors in each X/Y coordinate sample. All optical sensors produce some jitter. The amount depends on sensor quality, DPI setting, surface texture, and lens cleanliness.
Yes, at DPI values above the sensor's native resolution. Above native DPI, sensors use interpolation to generate additional counts, introducing artificial variance. Below native DPI, they use decimation — also introducing some jitter but less than interpolation.
At typical DPI settings (400–1600), jitter is sub-pixel and imperceptible during gameplay. At very high DPI (6400+), jitter can be visible during slow, precision movements. In actual gaming, cursor jitter is far less impactful than sensitivity mismatch or input lag.