Use when auditing slow page loads, heavy assets, or rendering delays related to Minimize critical request chains. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
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---
name: critical-request-chains
description: "Use when auditing slow page loads, heavy assets, or rendering delays related to Minimize critical request chains. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes."
metadata:
category: performance
priority: high
difficulty: advanced
estimatedTime: "20"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/performance/critical-request-chains
---
# Minimize critical request chains
Long chains of dependent requests delay the initial rendering of the page, as each resource must wait for its parent to be fetched and processed.
## Quick Reference
- Reduce the depth of dependent resource requests
- Inline critical CSS to avoid extra network roundtrips
- Use `preload` hints for essential assets found deep in the chain
## Check
Identify long chains of dependent requests that block the critical rendering path using Lighthouse or WebPageTest.
## Fix
Flatten the request chain by inlining critical resources or using preload hints for essential assets.
## Explain
Explain how critical request chains impact the Time to First Paint and how to optimize the rendering path.
## Code Review
Review the routes, assets, and loading behavior that affect Minimize critical request chains. 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/critical-request-chains
