I usually use Optifine to go along with a texture pack that I use, but after a download that came out on the 9th of July. I thought it was for 1.17.1 but it wasn't and thus I had used it and the day after I noticed my game begun to freeze when I went Idle / afk. Before this, I was able to afk for hours on a server for hours at a time. But I noticed when chat wasn't flickering, subtitles not moving or torches flickering.
I got rid of the optifine thinking it was the issue, it was not, and never had I had trouble with it before on any other pc. I did uninstall minecraft, mind you I forgot to delete the .minecraft as well. I even allocated more ram to my game. My pc still froze and was able to be fixed by moving the browser entirely. Twice did it really slow my pc down to be restarted. I even used the game without optifine and it froze. Java is up to date, as is my computer. I did the most of what I could do right now,
I even reinstalled Java to see if it was an error itself, my game is the only application doing this, and my computer still plays it fine. But I am unsure what the Idle Freeze thing can be done to be corrected. I haven't found a solution, and I think its a thing on 1.17 / 1.17.1.
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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