Use when auditing slow page loads, heavy assets, or rendering delays related to Enable text-based compression. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
Installs into .claude/skills of the current project.
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---
name: compression
description: "Use when auditing slow page loads, heavy assets, or rendering delays related to Enable text-based compression. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes."
metadata:
category: performance
priority: high
difficulty: beginner
estimatedTime: "10"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/performance/compression
---
# Enable text-based compression
Compressed assets download faster, reducing the time to first paint and improving the overall perceived performance, especially on slower mobile networks.
## Quick Reference
- Use Gzip or Brotli to compress text resources (HTML, JS, CSS)
- Brotli provides superior compression for modern browsers
- Significantly reduces data transfer size and load times
- Compression helps network cost, but it does not remove parse and execution cost from oversized bundles
## Check
Verify that text-based resources are served with `Content-Encoding: gzip` or `br` headers.
## Fix
Enable Gzip or Brotli compression in your web server (Nginx, Apache) or CDN settings.
## Explain
Explain how text-based compression works and its impact on asset delivery speed.
## Code Review
Review the routes, assets, and loading behavior that affect Enable text-based compression. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.
---
For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.
Rule page: https://frontendchecklist.io/rules/performance/compression
