partial thread expansion
Allow expanding just the last few comments in a thread, rather than always expanding the whole thing. A thread w/ ~200 replies takes 4-5 seconds to expand completely saturating 1 CPU core and then requires scrolling down through it all to get to the recent replies. This is particularly inconvenient if you are frequently switching channels or between Team view and Chat view as all threads are repopulated collapsed whenever you return to a channel.
We should be able to expand only the unread messages or 20 or so at a time.
Michael Marczak commented
It'd also be nice if we retained the history of our chat past the visible window. The second I need to scroll up, I need to wait 4-5 seconds for previous messages to load, and after they load, the scroll bar jumps down.
Would also be super nice if opening a thread of 200 replies didn't completely saturate a core.