Optimized:

• Lyrics now batch requests with rate limiting
• Predictive prefetching for upcoming tracks
• HUD layout caching (only recalculates on settings/resize)
• Consolidated thread pools into shared executor
• Added proper shutdown hooks
• Lyrics cache limited to 50 entries

Fixed:

• Memory leaks from orphaned thread pools
• Album art cache not cleaning up properly
• New thread pools created for every async operation
• Scheduled tasks not cancelled on shutdown