Minor performance optimizations

Some small (mainly roselynator based) performance cleanups.

Feel free to cherry pick or discard anything. Did not spend a lot of time on it, but since I saw you were doing some cleanup I thought this might help! Cheers on the support, appreciate it!

I am not fully sure how many of these changes the compiler usually picks up, but from my experience with Unity (using an old mono fork), it's best to be explicit. Especially comparing strings can help a lot