If you're having trouble with your game taking long to load into the in-game lobby or spectating even sometimes failing, adding Windows Defender or your antivirus exceptions should improve your experience and shave off some seconds from your launch time, making playing and spectating a bit more springly.
While this is not exactly news in the community, it's floating around for a few years already, especially in AoT where it causes more issues, it doesn't seem to be wide-spread enough knowledge to improve the general experience, so maybe this can help some make things smoother. I also included subtitles in case it was hard to understand me (that YT tool is actually legit cool).
Results depend on your computer configuration, so it may vary, but generally slower computers should benefit more.
Gl&hf! :-)