Frametime and Stutter Analyzer is a desktop frame-pacing telemetry viewer, CSV log inspector, and 2D render delta benchmark utility for Linux. An independent Linux alternative inspired by desktop frame-pacing analysis utilities such as CapFrameX, it evaluates per-frame render intervals to quantify smoothness, tail latencies, micro-stutter events, and multi-run performance differences.

Key Features:

• Multi-Format Frametime Log Parser: Imports real MangoHud CSV logs, PresentMon CSV captures, vkmark/glmark2 logs, and generic frametime/FPS CSV files with automatic header and unit detection (milliseconds, microseconds, or seconds).
• Built-In 2D Frame-Pacing Benchmark: Executes real QPainter 2D vector, particle, and alpha-compositing workloads while recording high-resolution time.perf_counter_ns() per-frame deltas across configurable resolutions and scene presets.
• Precision Tail Latency & Stutter Metrics: Computes Average FPS, Median FPS, 1% Low FPS, 0.1% Low FPS, P95/P99/P99.9 frametimes (ms), frame-to-frame stutter percentage (>2x moving median), and frame-pacing consistency scores.
• Visual Analytics & A/B Comparison: Plots interactive frametime timelines, FPS percentile curves, frametime distribution histograms, and multi-run A/B delta charts, with full CSV and JSON report export.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by CapFrameX or its developers.