For anyone madge about no longer being able to disable the addon profiler in 11.1.5 - just know that it's incredibly unlikely to have given you any performance gains in the first place. Both my testing and Blizzard internal testing showed that profiling has virtually no performance impact.
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Also it's important to note that WoW just generally runs pretty bad on it's own. Having a lot of other players around you also greatly decreases performance.
If you are 100% confident that disabling the profiler made a difference for you, send me your addon setup and PC specs.