Softonic

FPS Counter

Step 1 / 3 Current FPS
Seconds
frames
FPS
Next

Use this FPS counter to measure how smoothly your browser is rendering the current page. It samples frames with requestAnimationFrame, reports current, average, minimum and maximum FPS, and can draw a short graph so you can spot dips caused by heavy tabs, animations, extensions, throttling or display settings.

How to measure browser FPS

  1. 1

    Choose the sample length

    Five seconds is a good default. Use a longer sample when you want to catch periodic stutters or background load changes.

  2. 2

    Set smoothing and the warning threshold

    The smoothing window averages recent frames, while the threshold marks the FPS level you consider acceptable for the test device.

  3. 3

    Run the counter and read the spread

    Current FPS shows recent rendering speed. Average, low and high values reveal whether the session was consistently smooth or had visible dips.

What the FPS counter measures

This tool measures browser rendering cadence, not graphics-card benchmark performance. Every time the browser is ready to paint another frame, requestAnimationFrame calls the sampler. The time between two callbacks gives an instantaneous frame rate:

FPS = 1000 / frame_time_in_ms

The displayed current FPS is a moving average over the smoothing window. A window of 60 frames works well for normal 60 Hz displays because it calms one-frame spikes without hiding sustained drops. Smaller windows react faster; larger windows look steadier.

Worked example

Suppose a five-second sample records these simplified frame intervals:

Frame interval Instant FPS What it suggests
16.7 ms 59.9 FPS Typical 60 Hz rendering
8.3 ms 120.5 FPS Typical 120 Hz rendering
25.0 ms 40.0 FPS A visible slowdown on many displays
33.3 ms 30.0 FPS Heavy work or throttling

If your warning threshold is 50 FPS and the measured moving average ends at 47 FPS, the result is below target even if a few frames were faster. If it ends near 60 FPS with occasional dips to 45 FPS, the average is healthy but the minimum tells you there were stutters worth investigating.

Interpreting the results

Result pattern Likely meaning Next check
Average near refresh rate, low dips rare Rendering is healthy Compare with another browser only if needed
Average good, low value much lower Periodic stutter Close heavy tabs or inspect animations
Average below threshold Sustained render load Check CPU load, extensions and page scripts
FPS capped near 30 Power saving or throttling Check battery mode and display settings

Browser FPS is influenced by the display refresh rate, operating-system compositor, battery mode, thermal throttling, active tabs and the page itself. Run the test on a quiet tab first, then repeat while the page or app you are diagnosing is active.

Frequently Asked Questions

No. This counter measures how often the browser receives requestAnimationFrame callbacks. It is useful for web animation and page smoothness checks, but it is not a full GPU benchmark for native games.

Most browsers align animation frames with the display refresh rate. A 60 Hz monitor usually reports near 60 FPS, while 120 Hz or 144 Hz displays can report higher values when the browser and operating system allow it.

Use 50 FPS for a normal 60 Hz smoothness check. For high-refresh monitors, set the threshold closer to the experience you expect, such as 90 FPS or 120 FPS.

No. The measurement runs in your browser using local timing APIs. The tool does not upload frame data, screenshots or device details to an external API.

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