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Progress18 of 45
JavaScriptLow-Medium

Cache Storage API Calls

`localStorage`, `sessionStorage`, and `document.cookie` are synchronous and expensive. Cache reads in memory.

javascriptlocalStoragestoragecachingperformance

Code Comparison

Incorrect (reads storage on every call):typescript
Correct (Map cache):typescript
Cookie caching:typescript

Why This Matters

Impact: reduces expensive I/O. This optimization is classified as LOW-MEDIUM priority for production applications.