Noticed that caster enemies now move while casting. Someone pointed out that it started at last restart, so it's likely a fix that's gone wrong.
Also my group in Culling of Statholme experienced a minute of very high FPS before 3 of us had crashes. We also noticed that we were getting spam dazed by all of the mobs, which doesn't usually happen.
Made this thread so that others can say whether or not they've experienced the same issues or it was a one-off.