Just to give you some more information to resolve the lag issue.
Lord Bosun lags for me consistently every 18-20 precision arrows (15 seconds roughly) and then lags consistently for about another 6-8 precision arrows (5 seconds) and then becomes buttery smooth until another 18-20 precision arrows.
So something is happening in the background to that Boss on a cycle to consistently cause lag because we did it like 5 times and even with 1 dead, it did the same lag cycle.