Ver 1.8.13 here (but I've seen this going back some years now)
I think most are having this problem and I agree, it appears to be related to library scanning for updates.
I do have "Check for updates on startup" disabled.
This "temp freeze" also seems to just happen randomly. I can literally do nothing for a long time, come back to IDE, click on it, it responds then goes right into "freeze." Of course, not all the time.
Then, it can be working just fine and I'll add some code and maybe it'll go into freeze mode again.
I notice that it is reaching out to the internet, apparently looking for library updates again.
So I go into update libraries and update everything I use.
Some work and now, some say, Invalid Library found in....
What's interesting in that, is the location that it points to is within my "projects folder."
So I think IDE looks where it saves first to do updates or use libraries.
Then, I can work for hours without issue.
This is the same no matter which computer I use.
But here's something and I THINK this may have something to do with it (for me, anyway).
I don't save my sketches locally.
I save them to my project drive on my server.
I have to wonder if there might be a lag, sometimes, and IDE is "waiting" for the drive to become available... even though if I go into Explorer, it's all there instantly.
I also use MS Access and it too uses that same network drive. Works a charm, but yes, there are times, after no activity for a while, that is can hesitate when trying to access the dB.
I think, here anyway, it's a microsoft thing. On the server, I do have the drives configured to never go to sleep. But... we are talking microsoft here. LOL
I just thought I'd add to this thread because clearly, this is an issue many are having and I'm hoping that with more information, that perhaps the devs might be able to finally locate the issue and if not fix it, at least identify and confirm it.
If it turns out to be network lag then that's not IDE's problem.