Mouse Drag Test

How to use

1. Hold and drag. Press and hold your left button, then drag across the surface in any direction. Change direction a few times and keep the button held for at least 30 seconds.
2. Watch the dropout counter. Each time the button releases and bounces back within 80 ms, the counter ticks up and a red dot marks the location. Zero is the target. Any count above zero points to a failing switch.
3. Run it longer for intermittent faults. A degraded switch may hold fine for 20 drags and then drop once. If you suspect a fault, run the test for at least a minute before trusting a zero.
4. Check angle snapping. Click Reset, tap Angle Snapping, then slowly draw along the diagonal guide from left to right. Green means the sensor tracked your hand. Orange means it corrected your path toward horizontal.

Why test this

Left button dropping mid-drag is the kind of fault you dismiss the first time. Your selection fails halfway through, your file lands in the wrong folder, your spray breaks mid-hold. You assume you slipped. A week later it happens again. The switch is the culprit. Mechanical contacts wear with use. A single press can bounce the contacts open and closed before the spring settles. When that gap hits 80 ms, the OS reads a genuine release and the drag breaks. Debouncing hides early wear, so the fault tends to vanish during normal clicking and surfaces the moment you hold under load. Thirty seconds of dragging is enough to catch it. The counter records how often it happened, and the red dots mark where on the surface. Switch to Angle Snapping mode for a second check: draw the diagonal guide and see whether the sensor tracked your hand or quietly straightened the line.

What the results mean

The dropout counter adds one for every bounce-type release: the button opened and closed again within 80 ms while you were dragging. Zero is healthy. One or two hits in 30 seconds means the switch is wearing. Three or more means the fault is repeatable. Red dots on the canvas mark each dropout location. Clusters at one spot suggest a mechanical or positional issue. Dots spread across the surface point to oxidized or fatigued contacts. In Angle Snapping mode, the result comes from the slope of your drawn line. Drag the guide from left to right at a steady pace, then release. Green means your path held the guide's angle: the sensor tracked your hand without correcting it. Orange means the sensor nudged your diagonal toward horizontal. Draw at a slow, consistent speed and cover the full width for the most accurate reading.

FAQ

What is a mouse button dropout?

A dropout happens when your left button releases briefly while you're still holding it. The switch contacts bounce open, the OS registers a momentary release, then the button closes again. In-game that breaks a spray, a hold-to-fire, or a drag-select without you lifting a finger.

Why does my mouse keep letting go mid-drag?

Switch contacts wear down with use. As the spring fatigues, one press can bang the contacts open and shut several times before they settle. Software debouncing masks early-stage chatter, so the fault hides during ordinary clicking and shows up when you hold the button under sustained pressure.

What does the 80 ms threshold mean?

Any release that's immediately followed by a re-press within 80 ms gets flagged as a dropout. Letting go on purpose and re-pressing takes longer than that, so the 80 ms cutoff separates accidental bounce from a deliberate click.

What is angle snapping?

Angle snapping is firmware-level correction in some mouse sensors. When you move the mouse, the sensor nudges your path toward the nearest horizontal or vertical line. That works fine for spreadsheet work, but removes the micro-adjustments you need to track a moving target in a game.

How do I turn off angle snapping?

Open your mouse software (Razer Synapse, Logitech G HUB, SteelSeries GG) and look for Angle Snapping or Angle Correction in the sensor settings. Toggle it off, then run the test again to confirm.

Can I fix a switch that is dropping out?

A shot of contact cleaner into the switch gap can extend its life by weeks. Desoldering the switch and fitting a new one is the permanent fix. If the mouse is still under warranty, contact the manufacturer before opening the case.

Embed the mouse drag test on your site

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