How to check GPU shading throughput on a Chromebook
Measure your Chromebook's GPU shading and fill-rate score in a browser, understand what it says, and check whether software rendering is slowing it down.
A Chromebook can feel slow in a game or graphics-heavy website even when everyday pages load normally. To narrow down the cause, check how quickly its graphics processor handles a browser-based graphics workload.
The Graphics Test measures shading power and fill rate at 1080p and gives a score out of 100. It can help you compare runs on the same Chromebook, but it is not a direct prediction of game frame rates or proof that the GPU is faulty.
Run the graphics test
- Close games, video streams, and other graphics-heavy tabs. Keep the Chromebook awake and, if possible, connect its charger so the power state stays consistent.
- Open the Graphics Test in Chrome on your Chromebook.
- Start the test using the control shown on the page. Keep the test tab in front and avoid switching tabs or opening other apps while it runs.
- Note the shading and fill-rate results and the score out of 100. Run it two more times under the same conditions to see whether the results are broadly similar.
A browser test uses the graphics features that the browser can access. It does not inspect every part of the Chromebook's graphics hardware, so treat the score as a useful comparison rather than a full hardware diagnosis.
What the result means
The score is similar across runs
Consistent results suggest the Chromebook is performing steadily during this test. Compare results only when the conditions are similar, including the same device, browser, power state, and open tabs. A score of 70 does not mean the Chromebook is 70 percent as fast as another model, and the score does not translate directly into frames per second.
The score changes a lot between runs
Background activity, a hidden or minimized tab, heat, and power-saving behavior can all affect a browser workload. Close other tabs, let the Chromebook cool if it feels hot, then repeat the test without changing the setup. A small difference is normal. A large change that repeats may point to a workload or power issue rather than a broken GPU.
The score is very low or the test does not run
The browser may not be able to use hardware acceleration, or a browser feature may be unavailable. A low score by itself does not prove that the graphics chip is damaged. Check the browser's graphics status and update ChromeOS before drawing a conclusion.
How to improve or verify the result
- Close demanding tabs and apps. Video playback, games, animated pages, and many open tabs can compete for graphics and memory resources. Close them, then rerun the test in a fresh tab.
- Connect the charger and keep conditions steady. A Chromebook may limit performance to save battery or manage heat. Compare runs with the charger connected, and avoid testing while the device is hot or doing a large download or update.
- Check the browser's graphics status. Type
chrome://gpuin Chrome's address bar and look under Graphics Feature Status. Check the entries for WebGL and WebGL2. If they report software-only rendering or that a feature is unavailable, the browser may not be using the graphics processor for this workload. For help understanding the page, see how to check if your browser uses GPU acceleration. - Restart Chrome and the Chromebook. Close Chrome completely, reopen it, and test again. If the result stays unusually low, restart the Chromebook to clear a stuck browser process or temporary system issue.
- Install ChromeOS updates. Open Settings › About ChromeOS › Check for updates. Install any available update and restart when prompted. Then rerun the test in the same conditions.
- Check whether the issue appears outside the test. Try a few graphics-heavy pages or apps you normally use. If only this browser test performs poorly, it may be a browser compatibility issue. If multiple apps also show visual glitches, freezing, or crashes, contact the Chromebook manufacturer or your school's IT support.
What shading throughput does and does not show
Shading is the work used to calculate how pixels and surfaces look, including colors and lighting effects. Fill rate describes how quickly the graphics system can draw pixel data. The Graphics Test measures these kinds of browser graphics work at 1080p, which gives you a repeatable workload to compare.
Chromebooks often use integrated graphics, which share system resources with the processor rather than having a separate graphics card. A browser score also depends on ChromeOS, the browser's graphics support, and the current workload. It cannot confirm the exact GPU model, detect every hardware fault, or tell you how a specific game will run.
If your Chromebook has a low score but no other graphics problems, use the result as a baseline and compare again after updates or changes. If it shows recurring artifacts or crashes in several apps, save notes about what you saw and ask the manufacturer or a repair provider to inspect it.
