gpui-bench

A tool for designing, running, reviewing, and understanding performance benchmarks for GPUI, the user-interface toolkit used by Zed. It uses Criterion, a Rust library for measuring code speed, and can examine rendering, tasks, Metal frames, responsiveness, and hangs.

In plain words
What is it for?
Measuring GPUI rendering and task performance, checking frame data, isolating features, and investigating hangs or regressions.
Why use it?
It helps developers collect before-and-after performance evidence and identify slowdowns or responsiveness problems in GPUI code.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/zed-industries/zed/gpui-bench
Any agent
npx skills add zed-industries/zed --skill gpui-bench
Clone the repo
git clone --depth 1 https://github.com/zed-industries/zed

Made for: Claude Code, Codex.

Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,376 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00062 $0.04376
Opus 5 $0.00031 $0.02188
Sonnet 5 $0.00012 $0.00875
Haiku 4.5 $0.00006 $0.00438

Measured yesterday against content hash 76429dd2b2ad, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

gpui-bench scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf /tmp/zed-profiles/<name>.trace
.agents/skills/gpui-bench/SKILL.md · 388 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 388 lines · 62 tokens per session scan C 76429dd2b2ad

Subscribe to this mod's changes

gpui-bench is a skill published in the GitHub repository zed-industries/zed (89,467 stars, last pushed yesterday), with no licence file. It adds 62 tokens to every session and 4,376 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.