Unfortunately its free speech these days until someone more prevalent than you don't like it. Sounds like a horrible place to work anyway. You are better off.
Anyway 64 bit windows 7 should be good, it will use .net 6. Again, I'm often working on performance so make sure you are on the latest if you can. Most recent version significantly reduced the size of the binary.
I will look at the delay. Again, you raise a good point and I completely get it.