The EFCore change is pretty big. They're basically changing how the data is accessed from the database so that would touch most of the software, so potential for new issues is fairly high. Hopefully it will improve performance and concurrency. If you are not comfortable with potential issues, I'd hold off on updating for a while.

Thanks, so the goal is better performance? I'm not keen on testing betas but more performance, when the update is stable, is always nice

Performance is not the goal, but cleaner code and more manageable code. But both will ultimately lead to better performance.
As of now it was basically impossible to change something in the database structure since it was hard to estimate the impact of it.

this is a "beta", the 2nd Release Candidate. they'll mark a stable version when most of the bugs have been ironed out.

There was a typo in my previous comment, I'll definitely wait for the stable release.