tools.loumo.jp

FPS / Hz

Frame Rate Check

Measure your browser’s current rendering FPS and compare motion smoothness. The refresh rate is an estimate, not your monitor’s configured setting.

Current FPS
— FPS
Estimated refresh rate
— Hz
Frame time
— ms

Measuring… Please wait about 2 seconds.

Scrolling smoothness test

Current FPS

60 FPS equivalent

30 FPS equivalent

360 px/s

Default: 360 px/s. Adjust all three lanes together; this changes motion speed, not the target FPS.

All lanes use the same selected speed. Comparison lanes update at up to 60 / 30 FPS; they cannot exceed the browser’s rendering FPS. Display timing may cause uneven steps.

About this measurement

  • The nearest standard rate is shown as an estimate. It does not read the OS or monitor setting, and may differ considerably under load or with VRR.
  • Keep this tab active while measuring. Measurement restarts when you return to the tab.
  • PC load, browsers, power saving, VRR and multiple monitors can affect the result.
  • This is a simple check, not a precision measurement tool.

How to use this check

Keep this tab active and wait about 2 seconds for the numbers. Compare the lines, text and shapes across the three lanes. Adjust the speed to make the difference easier to see. Use Measure again after moving the window to another display.

FAQ

Does this show my monitor’s configured refresh rate?

No. It measures how often this browser renders frames. The estimated Hz value is the closest rate from a list of common values; it does not read the monitor or OS settings.

Why can the three lanes look similar?

Comparison lanes cannot update faster than the browser. At around 60 FPS, the current and 60 FPS lanes may look similar. At around 30 FPS, all three may look similar.

Why is the measured FPS lower than expected?

Load, power saving, browser behavior, VRR or multiple displays may affect the result. Keep the tab active, close heavy applications and check your display settings before measuring again.

Does the speed slider change FPS?

It changes the distance the pattern moves per second in every lane. The measurement method and the 60 / 30 FPS comparison targets stay the same.

What does frame time mean?

It is the average time between browser frames. Around 60 FPS is 16.67 ms, 120 FPS is 8.33 ms and 165 FPS is 6.06 ms. Smaller values mean more frequent updates.