FPS Test
Measures how many frames per second your browser draws while it animates thousands of particles. Pick a load level and watch whether FPS holds at your refresh rate or drops.
More Hardware Test Tools
This FPS test animates particles on a canvas and measures how many frames per second your browser manages. At Idle it shows your refresh rate. As you raise the load, the test shows whether your device keeps up, and the 1% low reveals stutter that the average hides.
How the Numbers Are Worked Out
The test keeps the last 3,000 frame times. Example: at a steady 60 FPS each frame takes 16.7 ms. If the slowest 1% of frames average 25 ms, the 1% low is 1,000 ÷ 25 = 40 FPS. Particles move by time rather than per frame, so a slower device shows the same motion with fewer frames, as a game would.
Reading the Result
| What you see | What it means |
|---|---|
| FPS equals your refresh rate at every load | Your device has spare capacity for this kind of drawing |
| FPS falls as load rises | The browser cannot finish frames in time at that load |
| Average fine, 1% low much lower | Occasional long frames: background work, power saving or a busy tab |
| Slowest frame over 100 ms | A visible hitch happened during the test |
What Changes the Result
- Refresh rate: the ceiling. Check it with the refresh rate test.
- Power settings: battery saver often caps frame rate on laptops.
- Hardware acceleration: if it is off in the browser settings, drawing runs on the processor and FPS drops sooner.
- Other tabs and apps: anything busy competes for the same processor time.
- Browser: different browsers draw canvas at different speeds, so compare on the same one.
FPS Test Questions
What does this FPS test measure?
How many frames per second your browser draws while it animates a set number of particles on a canvas. Each frame is one browser animation callback.
Why is my FPS stuck at 60, 144 or another round number?
A browser never draws faster than your screen refreshes, so at light loads FPS equals your refresh rate. That is a cap, not a sign of a slow computer.
What is 1% low?
The frame rate of the slowest 1% of frames. If the average is 144 FPS but the 1% low is 40, a few frames are taking far longer than the rest, which you see as stutter.
Does this predict my FPS in games?
No. Games use the graphics card very differently from a 2D browser canvas. Use the game's own benchmark or an in-game counter for that. This test is useful for comparing browsers, power settings or devices.
Why does FPS drop when I raise the load?
Each particle has to be drawn every frame. When the browser cannot finish a frame within one refresh interval, it misses that refresh and FPS falls.
Why did my result change when I unplugged my laptop?
Battery saver and power plans can slow the processor or cap the browser's frame rate. Test while plugged in for the best result.
Why does switching tabs break the reading?
Browsers pause animation in hidden tabs. The test skips that gap, but keep the tab in front for a clean result.
Last updated October 2026.