FPS Stability Tester — Measure Micro-Stutter & Frame Pacing

📅Published: February 22, 2026👤Author: FPS Tools Team

Go beyond simple frame rates. Our stability tester measures jitter, detects micro-stutters, and analyzes frame pacing to ensure your display and system are performing optimally.

Stability
100%
Jitter
0 ms
Avg Frametime
0 ms
Total Stutters
0
Frametime History (ms)0 FPS
0ms25ms (40 FPS)50ms (20 FPS)

System Stability Benchmark

Run a 15-second diagnostic to get your official Stability Grade.

Why FPS Stability Matters More Than Average FPS

A game running at a constant 60 FPS feels significantly smoother than a game fluctuating between 40 and 80 FPS. This consistency is called Frame Pacing. When frame pacing is inconsistent, you experience "micro-stutters" — tiny hitches that disrupt the fluid motion, even if your average FPS looks high.

Understanding the Metrics

  • Stability Score: A composite percentage of how consistent your frame delivery is. 100% means perfectly equal timing for every frame.
  • Jitter (ms): The average variation between consecutive frames. High jitter means uneven frame delivery.
  • Stutters: The number of times a single frame took more than twice the average duration to render.

How to Improve Stability

If you are experiencing low stability, try the following:

  • Close Background Apps: High CPU usage from other programs can cause frame time spikes.
  • Enable/Disable VSync: VSync can help with tearing but sometimes introduces irregular frame pacing.
  • Check Temperature: Thermal throttling can cause the GPU/CPU to drop performance momentarily.

Frequently Asked Questions

What is a good stability score?
A score of 95% or higher is considered "Ultra" stability. Most well-optimized systems should reach at least 90%. Anything below 80% will likely result in noticeable stuttering.
Why does my browser show stutters?
Browsers are multi-tasking environments. Garbage collection, tab switching, or extensions can occasionally interrupt the rendering loop, causing a spike in frame time.