Agent Skills › erweixin/RaTeX › render-bench

render-bench

GitHub

用于运行 RaTeX 渲染性能基准测试，支持100公式多格式渲染、冷/热字体缓存计时及阶段分解。适用于优化前后对比或分析渲染路径性能瓶颈。

skills/render-bench/SKILL.md erweixin/RaTeX

Trigger Scenarios

评估渲染路径变更后的性能影响提交优化前进行性能基线测试对比不同渲染器（PNG/SVG/PDF）的性能差异

Install

npx skills add erweixin/RaTeX --skill render-bench -g -y

More Options

Use without installing

npx skills use erweixin/RaTeX@render-bench

指定 Agent (Claude Code)

npx skills add erweixin/RaTeX --skill render-bench -a claude-code -g -y

安装 repo 全部 skill

npx skills add erweixin/RaTeX --all -g -y

预览 repo 内 skill

npx skills add erweixin/RaTeX --list

SKILL.md

Frontmatter

{
    "name": "render-bench",
    "description": "Run RaTeX rendering performance benchmarks (100-formula PNG\/SVG\/PDF, cold-vs-hot font cache timing, phase breakdown). Use when profiling render performance or comparing before\/after optimization changes."
}

Render performance benchmarks

Cross-tool layout (Cursor / Claude Code / Codex)

Canonical copy: repository root skills/render-bench/SKILL.md (this file).
Tool entry points (symlinks to this file in-repo):
- Cursor: .cursor/skills/render-bench/SKILL.md
- Claude Code: .claude/skills/render-bench/SKILL.md
- Codex: .agents/skills/render-bench/SKILL.md

When to use

After changes to rendering paths (especially renderer.rs, fonts.rs, standalone.rs, outline caching, font loading).
Before committing optimizations — run cold first so cache impact is visible.
Comparing before/after for a specific renderer (PNG vs SVG vs PDF).

Prerequisites

Rust toolchain with --release.
KaTeX TTFs in fonts/ (committed in-repo; 20 .ttf files).
(Optional) CJK/emoji system fonts for the full CJK/emoji categories.

Commands

1. Full 100-formula benchmark

cargo test -p ratex-render --test bench_render --release -- --ignored --nocapture

Renders 100 formulas across 6 categories (math, complex, matrix, cjk, emoji, chem) in PNG, SVG, SVG-standalone, and PDF. Prints per-category averages and overall throughput (formulas/sec).

Warmup: 1 iteration per formula. Measurement: 3 iterations, averaged.

2. Font cache cold vs hot timing

cargo test -p ratex-render --test font_cache_timing -- --ignored --nocapture

Measures 3 formulas: first pass (cold — disk I/O for font loading), second pass (hot — OnceLock cache hits). Reports speedup ratio.

3. Render phase breakdown

cargo test -p ratex-render --test phase_breakdown --release -- --ignored --nocapture

Per-formula breakdown: parse+layout vs render phase timing. 6 formulas including CJK and emoji cases. Warmup: 3 iterations, Measurement: 10 iterations, averaged.

4. Compare before/after (quick diff)

Useful when optimizing a specific path:

# Before (on main)
cargo test -p ratex-render --test phase_breakdown --release -- --ignored --nocapture 2>&1 | tee /tmp/before.txt

# After (on branch)
cargo test -p ratex-render --test phase_breakdown --release -- --ignored --nocapture 2>&1 | tee /tmp/after.txt

# Diff the tables
diff /tmp/before.txt /tmp/after.txt

Quick checklist

Run cargo test -p ratex-render --test bench_render --release -- --ignored --nocapture for the full picture.
For quick iteration, use phase_breakdown (faster, 6 formulas).
For font-loading specific changes, use font_cache_timing.
Always use --release — debug builds are 10-50× slower and meaningless for perf comparison.