- Added performance markers in `ndView.tsx` to track startup and rendering times.
- Implemented caching logic for custom train data in `useAllTrainDiagram.tsx` with timestamps for data readiness.
- Optimized station data retrieval in `useStationList.tsx` by creating indexes for faster access.
- Refactored train delay data handling in `useTrainDelayData.tsx` to improve cleanup on unmount.
- Introduced tests for shared in-flight requests and timetable cache functionality to ensure reliability.