After Wednesday's patch last night's T1 LS raids had the worst lag for me since raiding on dial up 20 years ago. It was almost unplayable. I have been totally fine raiding until Wednesday.
Not played for a week until Sunday, had a lot of chat lag from the moment I logged in. Seemed to take a lot longer for the script to end after completing a raid also, the same with completing and starting Overseer quests.