Here are the most common reasons your Xbox is lagging:
Slow connection: Keep your Xbox within range of your router or use an Ethernet cable.
Full storage: The Xbox can run slowly if your hard drive is full. You might need to delete old games or apps.
Clear the cache: Delete temporary data from your Xbox by clearing the cache.
Failing internal hard drive: If your games glitch and freeze, or your console doesn’t respond to your control, the hard drive might be failing.
Dust: Dust is a huge reason why Xboxs run slowly. If the fan is clogged with dust, it could slow everything down.