Almost every playlist I go on ends up being very, very laggy. I didn’t seem to have any of these problems before releasing the may and June hotfixes. I think it’s possible that it’s the fixes but if, not then the servers need some serious work.
Best thing to do is to report instances of these in the support forums. There’s a pinned thread for server feedback: Screenshots, video clips and links to games are encouraged. There is also a feedback thread for the latest hotfix pinned at the top of this forum