How do I install the Render Bench skill?

Run npx skillmds@latest add erweixin/render-bench in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Render Bench safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Render Bench?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Render Bench free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Render Bench?

erweixin (@erweixin) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Render Bench by erweixin — Agent Skill

Name: Render Bench
Author: erweixin

File contents

Render performance benchmarks

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 --release -- --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.

---name: render-benchdescription: 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## 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```bashcargo 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```bashcargo test -p ratex-render --test font_cache_timing --release -- --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```bashcargo 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:```bash# 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 tablesdiff /tmp/before.txt /tmp/after.txt```## Quick checklist1. Run `cargo test -p ratex-render --test bench_render --release -- --ignored --nocapture` for the full picture.2. For quick iteration, use `phase_breakdown` (faster, 6 formulas).3. For font-loading specific changes, use `font_cache_timing`.4. Always use `--release` — debug builds are 10-50× slower and meaningless for perf comparison.

Frequently asked questions

Render Bench