GPU benchmark stutters after waking from sleep

You wake your computer, start a graphics benchmark, and see the animation hitch or pause. If it ran smoothly before sleep, it is not clear whether the GPU, browser, or power settings are responsible.

Use the Graphics Test to compare runs on the same computer. It measures browser graphics performance with shading and fill-rate work at 1080p, then gives a score out of 100. The result can help narrow down the cause, but it cannot diagnose a failing graphics card on its own.

Compare the benchmark before and after sleep

1. Open the Graphics Test and run it once while the computer is responsive. Note whether the graphics look smooth and record the score for comparison.
2. Put the computer to sleep, wake it, and wait about a minute for the desktop and connected displays to settle.
3. Run the test again under the same conditions. Keep the browser window size, display setup, and power connection unchanged.
4. Wait a minute, then run it once more. A hitch on the first run that disappears on the next run is different from stuttering that continues throughout both tests.

Close other demanding browser tabs and apps before comparing. If the computer is connected to a dock or external monitor, leave that setup in place for both runs. Changing displays or adapters can change the work the browser has to do.

What the result means

Only the first run stutters

The graphics system or browser may still be settling after sleep. A one-time pause is not enough to show that the GPU is damaged. If later runs are smooth and similar to your normal results, keep an eye on it rather than treating one hitch as a failure.

Every run stutters, but other graphics apps look normal

The problem may be limited to the browser's graphics process, its hardware acceleration setting, or the way it is drawing on the current display. Try reopening the browser and checking its graphics settings before changing hardware.

Every run stutters, and games or other apps also slow down

This points more toward a wider driver, power, temperature, or system issue. The Graphics Test is a browser workload, so its score cannot confirm a hardware fault. Compare behavior in another graphics app and check whether the slowdown also happens when the computer is plugged in and fully awake.

The screen flashes, goes black, or the browser recovers

The graphics driver or browser graphics process may have reset. If this happens repeatedly after sleep, update the graphics driver or operating system, and check whether a dock, external display, or recent setting change is involved.

How to fix it

1. Give the computer time to wake fully. Wait about a minute after signing in, especially if an external monitor or dock is connected. Then reload the test page and compare another run.
2. Close and reopen the browser. Save any work first, then quit the browser completely and start it again. This can clear a graphics process that did not recover cleanly from sleep.
3. Connect the charger and check power mode. On Windows 11, open Settings › System › Power & battery and check Power mode. On a Mac, open System Settings › Battery and check Low Power Mode or Energy Mode, if that option is available. Compare runs using the same power mode.
4. Check the browser's graphics acceleration setting. In Chrome, open Settings › System and check Use graphics acceleration when available. In Edge, open Settings › System and performance and check the same setting. Change it only to compare, then restart the browser before testing again. If the problem occurs in just one browser, leave the other browser's setting unchanged as a comparison.
5. Check the graphics preference in Windows. If your computer has more than one GPU, open Settings › System › Display › Graphics, choose your browser, and select Options to check its graphics preference. Compare the Windows choice with the setting that was in place before the problem began. On macOS, graphics selection is generally managed by the system, so check power mode and restart the browser instead.
6. Reset or update the graphics software. On Windows, press Windows + Ctrl + Shift + B to ask Windows to reset the graphics driver; the screen may flash briefly. If stuttering continues, install an available graphics driver update or Windows update. On a Mac, install available macOS updates through System Settings › General › Software Update.

When to suspect a hardware problem

A browser benchmark alone cannot prove that a GPU is defective. It uses a limited graphics workload, and its score can change with the browser, display setup, power mode, and background activity.

Hardware is more plausible if the stuttering continues in several graphics apps after a restart and software updates, or if you also see colored blocks, repeated black screens, crashes, or unexpected shutdowns. Stop stressing the computer if it becomes unusually hot or unstable. For a new device, contact the seller or manufacturer while it is under warranty. For an older computer, a repair shop can check the GPU, cooling, and power delivery.

Why waking from sleep can affect a browser test

Sleep reduces or pauses activity in parts of the computer. When it wakes, the operating system, graphics driver, browser, and display may need to reconnect and resume normal work. The first few frames can hitch while those parts catch up. A dock or external monitor can add another change for the system to handle.

The Graphics Test measures how this browser-based workload behaves at that moment. It does not report the GPU's exact temperature or prove that the same issue will happen in a game. Compare repeat runs and your usual apps before deciding whether the problem needs further repair.