Check GPU shading throughput before a large file conversion
Check GPU shading and fill rate before converting a large image batch, then learn what the score can and cannot predict about conversion speed.
A large image conversion can make your computer feel sluggish, take longer than expected, or cause the browser to stall. Checking graphics performance first can help you spot a slowdown, but a GPU score is not a direct estimate of how long your conversion will take.
Use the Graphics Test to check shading power and fill rate at 1080p, and record its score out of 100. Then compare that result with how your computer handles a small sample of the files you plan to convert.
Check GPU shading throughput
- Close the conversion page and other graphics-heavy apps or tabs. If you are using a laptop, connect its charger so power-saving behavior is less likely to affect the result.
- Open the Graphics Test in the browser you plan to use. Run the test and let it finish without switching tabs or moving the browser to another display.
- Note the shading result, fill-rate result, and score out of 100. These describe performance in the test's 1080p graphics workload, not a guaranteed conversion speed.
- Run the test one more time under the same conditions. If the results are similar, you have a more useful baseline than a single run.
- Convert a small, representative group of your files before starting the full batch. If you want to use TooLab for this, open the Image Converter. It supports JPG, PNG, WEBP, GIF, BMP, ICO, and TIFF, with up to 50 images at once.
For a fair comparison, keep the browser, file types, output format, and batch size the same. A few images can reveal whether the conversion itself slows down, even when the graphics score looks normal.
What the result means
The score is similar across both runs
Your graphics performance was reasonably steady during these short tests. That is a useful baseline, but it does not prove that a large conversion will finish quickly. Image conversion can depend on the processor, memory, browser, file size, and the specific decode and encode methods in use.
The score is lower than your usual result
Compare it only with a result from the same computer, browser, and similar conditions. A lower result can follow a change in power mode, background activity, heat, or browser graphics settings. It does not by itself prove that the GPU is damaged.
The two runs differ noticeably
Something may have changed during the test, such as a tab loading graphics, the computer switching power behavior, or the device warming up. Close extra work, wait a few minutes if the computer is hot, and repeat once. A browser test is affected by the rest of the system.
Shading and fill rate do not match your expectations
Shading and fill rate describe different parts of the graphics workload. Neither one is a direct measure of a photo converter's speed. A conversion may use little GPU acceleration, or it may use graphics hardware for some steps while relying on the processor for others. Check a small conversion batch to learn how your actual task behaves.
The score is low, but conversion seems fast
That can be normal. If the converter is mainly limited by CPU work or file handling, a graphics score may have little effect. If your small sample converts quickly and the browser stays responsive, the GPU result alone is not a reason to delay the batch.
How to get a more reliable result
- Keep other work quiet. Pause games, video playback, large downloads, and other graphics-heavy pages before testing. Close them rather than just minimizing the windows.
- Use a consistent power mode. On Windows 11, check Settings › System › Power & battery › Power mode. On a Mac laptop, check System Settings › Battery and whether Low Power Mode is enabled. Use the same setting for both test runs and the conversion.
- Check browser graphics settings. Hardware acceleration can affect browser graphics workloads, but the setting name and location depend on the browser. If you change it, restart the browser and rerun the test. This does not guarantee that the converter will use the GPU.
- Choose the browser's graphics preference on Windows if needed. In Windows 11, open Settings › System › Display › Graphics, select or add the browser, then choose Options. A high-performance preference may use more power and does not ensure faster file conversion. macOS generally manages graphics selection automatically.
- Give a warm computer time to cool. A computer can reduce performance when it gets hot. Move it onto a hard, clear surface and wait before testing again. Avoid repeatedly running graphics tests if the device is already very hot.
- Update the browser and graphics driver only if results stay abnormal. First install normal system and browser updates, then restart and test again. Driver update steps differ by computer maker, so use the support instructions for your device.
Why a graphics score cannot predict conversion time
The Graphics Test draws and processes graphics in a browser. A file conversion has a different job: it must read each source file, decode its contents, create the chosen output, and save it. A large image may also use more memory than a small one. A strong shading score cannot tell you how quickly every one of those steps will run.
Use the score to compare the computer with itself under consistent conditions, not as a universal ranking. For a practical estimate, convert a few representative files first, note how long they take, and make sure the browser remains responsive. The Image Converter processes files in your browser, and your files stay on your device.
