MacBook M3 Pro issues after update

Restart in Safe Mode. Same problem? If it works normally then the problem is with some third party software that may be causing a problem and perhaps needs to be updated; or some unneeded stuff like antivirus.

Please run Etrecheck and post its full report here.

Use the “additional text” button and paste the report into the text box.

There are several issues appearing in the report

The 1 item that Jumps Out as a Starter

Size: 494.38 GB

➡️ Free: 85.56 GB ⬅️

Available: 115.66 GB

From another contributor @etresoft regarding Free Space and Available Space 

Free vs available disk space huge differe… - Apple Community

Quote >>  “ The "available" storage is the amount of used storage that the operating system could automatically delete if it felt that it was really necessary. The "free" storage is the amount that you can actually use for something.

There are system processes that run in the background and automatically delete some of the "available" storage and convert it to "free". If you completely run out of storage, then those system processes will try a little harder. When you "delete" files you are just hinting to the operating system that you don't need those files anymore. The operating system will eventually remove them, but on its own schedule.

Certain tools will allow you to force the issue and manually clean up some of this storage and manually delete local snapshots. But that is only temporary. "  << End Quote