GPU stress test online. The same scene on every card.
Load your graphics card from this browser with a fixed 3D scene and a path tracer, and see how fast and how evenly it draws. No install, no account.
Illustrative frame rates. Not a measurement.
Raster scene
Fixed 1600 × 900
Path tracing
Fixed 960 × 540
Frames
Timed to completion
Reports
FPS, smoothness, decay
Two GPU loads, both fixed, both timed.
The free run loads the graphics card twice: a lit 3D scene for frame rate and pacing, then a path tracer that keeps the card busy for the rest of the run.
- A fixed resolution
- The scene renders at 1600 by 900 whatever the window size, so every card draws the same pixels and a faster card simply finishes more frames.
- Timed to the last frame
- Frames are timed to GPU completion in batches of a few, so a frame time is how long the card took to finish them, not how long the browser took to queue them or how often the screen refreshes.
- Path tracing to the end
- A path tracer then runs samples back to back at 960 by 540, the heaviest work a browser can give a graphics card, which is where thin laptops separate from desktops.
- Warm-up left out
- The first seconds are excluded to cover shader compilation. A hidden tab pauses the stage and its clock, and the report says so.
Speed and smoothness are different numbers.
A single average hides stutter. The report gives frame rate, how evenly frames arrived, and how much of its opening speed the card kept.
Frames per second
The median of the best one-second windows. If frames finish faster than the timer can measure, the report marks the figure as a lower bound.
Smoothness
The share of one-second windows close to the median. A card that is fast on average but stutters scores lower here.
Slowdown
Whole ten-second camera periods from the start compared with the last ones, so like is compared with like. A drop inside the run's noise shows as 0%.
Samples per second
How much path tracing work the card completed, and how steadily, while it stayed under constant load.
Illustrative frame rates. Not a measurement.
Hardware
What it needs. Three tiers, no fine print.
Minimum
Any GPU with WebGL2
Integrated graphics complete the test; low figures are still a measurement of that chip.
Recommended
Plugged in, browser updated
Battery saving and old graphics drivers both lower the result.
Optimal
The Deep run
9 minutes, adding loops of the scene, soft shadows and a combined CPU and GPU load.
In short
GPU stress test: the answer first
This GPU stress test draws a fixed 3D scene at 1600 by 900 and then runs a path tracer at 960 by 540, timing every batch of frames until the graphics card has finished it. The result is how fast the card draws, how evenly, and whether it gives up speed between the first and last periods of the stage.
Reading your result
- Frames per second is the median of the best windows
- It is taken from one-second windows after the warm-up. When frames finish faster than the timer can resolve, the figure is marked as a lower bound rather than rounded up.
- Smoothness tells you about stutter
- A card that is fast on average but delivers some windows far below the median scores lower here. That is the stutter you would feel in a game.
- Slowdown compares whole periods
- Whole camera periods at the start are compared with the last ones, so the same scene is compared with itself. A change inside the run's noise reads as zero.
What good looks like
The ranges, before you run it.
Graphics smoothness
- 90% or more
- Smooth
- Frames arrive at an even pace.
- 75% to 89%
- Mostly smooth
- Occasional uneven frames.
- Below 75%
- Uneven
- Visible stutter is likely in motion.
Overall score (provisional bands)
- 85 to 100
- Excellent (provisional)
- Fast, and it keeps its speed under long work.
- 70 to 84
- Strong (provisional)
- Comfortable for demanding work.
- 55 to 69
- Good (provisional)
- Fine for everyday and moderate work.
- 40 to 54
- Modest (provisional)
- Everyday tasks; heavy work will feel slow.
- Below 40
- Limited (provisional)
- Struggles with sustained work.
What a browser cannot see
The honest limits, and where to look instead.
- How full your memory isA web page cannot see how much memory is in use. If the machine slows down with many apps or tabs open, check it directly.
- On a MacActivity Monitor, Memory tab: Memory Pressure at the bottom. Yellow or red means memory is the limit.On WindowsTask Manager (Ctrl+Shift+Esc), Performance, Memory. Above about 85% in use while you work means memory is the limit.
- Temperatures and fan speedNo browser can read a temperature sensor, so heat shows here only as speed lost over time.
- On a MacA free app such as Stats shows temperatures and fan speed.On WindowsHWiNFO, or your laptop maker's own app.
- Storage speed and healthOpening apps and files depends on the drive, which this test does not touch.
- On a MacDisk Utility, then First Aid on your main drive.On WindowsCrystalDiskInfo shows the drive's health status.
Questions
GPU stress test, answered
- Can I stress test my GPU online without downloading anything?
- Yes. This test loads your graphics card through the browser and times every frame. Nothing is installed and nothing is uploaded.
- Is an online GPU stress test safe?
- Yes. Graphics cards slow themselves down to protect against heat long before damage is possible, and the run stops the moment you close the tab.
- Why is my frame rate marked as a lower bound?
- When frames finish faster than the browser timer can resolve, or land exactly on your screen's refresh interval, the true rate may be higher. The report says so rather than showing a capped number as your card's speed.
- Does it show GPU temperature or VRAM use?
- No. No browser exposes graphics card temperature, power draw or video memory. The test measures speed, smoothness and slowdown instead.
- Will integrated graphics work?
- Yes. The scene is moderate on purpose, so integrated graphics finish the test and still produce a meaningful frame rate, smoothness and slowdown.
- How long should a GPU stress test run?
- Long enough for heat to build in the card and the chassis. The Standard run gives a first answer; the Deep run holds the load longer and re-tests the machine hot, which is where thin laptops separate from desktops.