Studio froze when I tried to exit the test server and test player, not much more information on how to replicate it, but when it froze, it froze all other studio windows I had open that were not test player or server instances.
Now while playing in test player, I tend to get a lot of lag spikes for a few seconds, then happen again after another 5 seconds. Still not much more information on how replicate this bug but it is quite persistent.