ECO-CMP-JS-008 — Excessive DOM reflow¶

Category: Computation (CMP)
Family: JavaScript (JS)
Layer: Code
Tier: 1
Severity: warning
Tags: javascript, dom, performance
Legacy ID: ECO-JS-008

Summary¶

Layout thrashing increases CPU and drains battery.

Repeated measure/mutate cycles trigger expensive layout work.

{
  "confidence": 0.7,
  "notes": "Common in complex UI interactions.",
  "type": "cpu"
}

{
  "languages": [
    "javascript"
  ],
  "method": "trace"
}

{
  "guidance": "Batch DOM reads/writes; use requestAnimationFrame patterns.",
  "tradeoffs": "Refactor UI code."
}

{
  "system_layers": [
    "code"
  ]
}