The stateCache.maxSize (100) differs from the comment on line 93 which mentions 250 items max. Consider using consistent values or updating the comment to match the actual configuration.

[nitpick] Using console.warn for PerformanceObserver availability is appropriate for debugging, but consider using a more structured logging approach or making this configurable for production environments.

Silent exception handling when parsing JSON could mask important parsing errors. Consider logging the error or providing more specific error handling for malformed browser action messages.

Using Math.random() for cleanup scheduling creates unpredictable behavior that could affect performance testing and debugging. Consider using a deterministic approach like a counter or time-based interval.

[nitpick] The performance issue callback only logs to console. Consider implementing more robust error handling or user notification for performance degradation in production.

The stateCache.maxSize is set to 100 here, but the comment in virtualization/index.ts line 93 mentions "LRU cache: 250 items max". Could we align these values for consistency?

This inconsistency might confuse developers about the actual cache size being used.

Is using console.warn appropriate here for production? Consider using a more structured logging approach or making this configurable:

Silent exception handling could mask important parsing errors. Consider at least logging in development mode:

Using Math.random() for cleanup scheduling creates unpredictable behavior. Consider a deterministic approach:

You'll need to add the cleanupCounter ref at the component level.

The performance issue callback only logs to console. For production, consider implementing a more robust error handling mechanism that could notify users of performance degradation or automatically adjust settings:

The performance monitoring effect should include proper cleanup dependencies to prevent potential memory leaks. The interval continues running even after the component unmounts. Consider adding dependencies:

This ensures the effect re-runs when messages change significantly.

The MessageGroup interface could benefit from more specific TypeScript types. Consider using a union type for better type safety:

This would catch typos at compile time rather than runtime.

Consider wrapping the detailed debug log for viewport config calculation in a development-only check (e.g. process.env.NODE_ENV) to avoid performance overhead and excessive logging in production.

The performance monitoring interval logs verbose performance reports every 5 seconds; consider gating these logs behind a development flag to prevent clutter in production.

The debug logs in handleScroll are very detailed and may overwhelm the console in production; consider wrapping these logs in a condition so they run only in development.

The dispose callback logs detailed information whenever a message state is evicted. Consider removing or gating this log in production to avoid exposing internal state details or flooding the log.

The getState method logs cache hits and misses verbosely. Consider introducing a conditional check (e.g. based on development mode) to limit such detailed logging in production.

Consider using a counter/toggle for throttling memory and DOM updates instead of relying on 'Date.now() % 2' and 'Date.now() % 3'. With a fixed 5000ms interval, these modulo checks may always yield the same result, causing updates to run on every cycle (or never).