No barrel icon imports

Direct path icon imports OR optimizePackageImports

Dynamic import for heavy component

Heavy component has ssr:false

Analytics deferred

Analytics has ssr:false

Preload on hover or focus

SSR window guard in preload

Conditional module loading

Loading fallback provided

Promise.all for independent fetches

Early promise start in API route

Parallel RSC composition

Synchronous page shell

React.cache() used

React.cache() with primitive args

after() for non-blocking side effects

Minimal RSC props

No sequential independent awaits

Suspense boundaries used

SWR for data fetching

localStorage version prefix

localStorage try-catch

Minimal localStorage fields

Functional setState in callbacks

No stale state in useCallback

toSorted() for immutable sort

Passive scroll/touch listeners

Deferred state reads in callbacks

Map or Set for lookups

Lazy state initialization