The optimizations look good and address the performance issue appropriately:

1. Timeline.tsx and TopPanel.tsx: Adding React.memo wrappers prevents unnecessary re-renders when parent components re-render. The props passed to these components are stable (refs, memoized callbacks, or constants), so the memoization will be effective.

2. use-breakpoint.ts: Using a ref to track the current breakpoint value and only calling setCompactUI when the value actually changes prevents redundant state updates during rapid resize events. This is a solid optimization.

The code follows React best practices and is consistent with patterns used elsewhere in the codebase. No issues found.

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