Refresh Rate Test

Use the refresh-rate test to estimate repaint cadence and frame time in the browser. This page opens the shared monitor tester in timing mode. Keep the page visible and allow a short sampling period before comparing readings. The number describes the timing observed by this page; it is not a direct readout of the monitor’s hardware refresh-rate setting.

What the estimate measures

IO uses the shared application frame clock to observe the intervals between browser frames. Repaint frequency and frame-time observations summarize that delivery cadence. They can help you compare how the page behaves on different displays or under different conditions. A nominal 60, 120 or 144 Hz panel does not guarantee the browser will deliver exactly that cadence on every frame or in every configuration.

Conditions that affect browser Hz

Operating-system display settings, variable refresh, browser scheduling, graphics load, power saving and multiple monitors can influence results. Background tabs may be throttled, so use an active visible page. Repeat comparisons under similar conditions rather than treating one reading as a hardware verdict. Browser timing cannot independently measure panel response time, identify every dropped display frame or verify a manufacturer’s advertised refresh specification.

Related monitor checks

Switch to the monitor test for color fills, gradients, pixel patterns and geometry inspection. Its motion controls provide a visual comparison with adjustable speed and direction. Both pages share one monitor, scene and render loop; moving between them changes the entry pattern without creating another tester. IO stores timing observations only in page memory and does not upload them. Use the overview arrow to return to the workstation and select another device.