The solution to Tesla Bluetooth music playing lag is as follows:

1. Restart your phone: Try restarting your Tesla phone. This can sometimes solve temporary software problems, including Audio stutters.

2. Update software: Make sure your Tesla phone is running the latest version of the operating system and applications. Updating your software from time to time can fix known issues and improve performance.

3. Close background applications: Close other unused applications to ensure that your Tesla phone has sufficient system resources to handle audio playback. Running too many applications for a long time can cause lag.

4. Clear the cache: Try to clear the cache data of the audio application on the Tesla phone. This clears temporary files and data that may be causing lag.

5. Adjust the audio settings: In the audio settings of the Tesla mobile phone, try adjusting settings such as volume, equalizer and sound effects to see if the quality of audio playback can be improved.