ScreenCheckv1.0
motion
1 min
Client-Side Local

FPS Comparison

Demonstrates the perceptual difference in motion smoothness across multiple simultaneous frame rate lanes. Clearly indicates when a high FPS lane exceeds your monitor’s physical refresh capability.

Testing Instructions
  1. Observe the moving test objects across each separate FPS lane simultaneously.
  2. Notice the reduction in perceived strobing and ghosting as frame rates double.
  3. Adjust speed (px/s) or toggle higher refresh lanes (144, 165, 240) if your hardware supports it.
  4. Enter fullscreen (Press F) to eliminate OS window compositor stutter.
Interaction Controls
Next Pattern
→Space
Previous Pattern←
Exit FullscreenEsc
Mouse / TouchTap screen to cycle
Physical Refresh Limitation: Your display is operating at approximately 60 Hz. Higher rate lanes (e.g. 120/144/240 FPS) cannot render frames faster than your panel’s physical refresh interval. They are shown for cadence comparison but will visually cap at 60 Hz.
Motion Controls
Velocity (px/s)
Motion Direction
Background Contrast
Moving Pattern
Active FPS Lanes:

What This Test Checks

  • Perceptual motion smoothness across simultaneous 30, 60, 120, 144, and 240 FPS update rates.
  • Visual phantom-array effect (stroboscopic stepping) visible at 30 and 60 FPS.
  • Dynamic adaptation when selected framerates exceed display panel refresh capability.

How to Perform the Test

  • Track the moving objects horizontally across each lane simultaneously.
  • Notice how 30 FPS appears stepped and choppy, 60 FPS is fluid, and 120/240 FPS are razor-sharp.
  • Toggle lanes on and off or adjust velocity using the control panel below.
  • Press F to enter Fullscreen mode for the most accurate visual experience.

What to Look For

  • Stroboscopic stepping: At 30 FPS, fast-moving objects leave multi-image phantom trails on your retina.
  • Hold time blur: Higher FPS reduces frame hold time, increasing legible detail on moving shapes.
  • Hardware cap warning: If your display runs at 60Hz, higher lanes will visually cap at 60 FPS.

Common Display Problems & Diagnostic Guidance

Why does 120 FPS look identical to 60 FPS on my screen?

If your monitor is a 60Hz display, it cannot physically draw more than 60 frames per second. To truly see 120 FPS or 240 FPS, a high-refresh gaming monitor (120Hz+) is required.

Mouse / OS Stutter in Windowed Mode

Desktop window managers can occasionally cause micro-stutter when running in a window. Enter fullscreen mode (F) for direct compositing.

Frequently Asked Questions

Can the human eye see more than 60 FPS?

Yes, easily. The human eye does not operate in discrete frames. Research shows humans perceive motion smoothness improvements and input lag reductions well past 240Hz and 360Hz.

What is the difference between FPS and Refresh Rate (Hz)?

FPS (Frames Per Second) is how many images your GPU/software generates per second. Hz (Hertz) is how many times per second your physical monitor refreshes the screen image.