When opening a second file in gedit (so that two tabs are open) it significantly slows down the system and the cursor rotates for around 5 to 10 seconds. This looks very odd as these files are practically not consuming any resources.
I have multiple tabs (6+) open in gedit the whole day and I don't experience any performance issue. Could you check the processes to see if you can identify what eats your cpu power during that laps of time ?
On my original internal "NVMe SSD" drive I created now two new files in my "Dowloads" folder: "blabah_1" (11 bytes) and "blabah_2" (11 bytes). They both content just one single word: "blabah". If I open only one of them, everything is ok - but if I open both two files, cursor rotates for around 10-15 seconds: rotating cursor is visible only if I move the cursor over the left dock panel or at the top of the screen over the file name. Cursor continue to rotate even after closing both two files and Nautilus too.
By the way, what do you think about LibreOffice cold start time (at the end of video)?
Have opened two gedit windows with 2 files in each and not seeing any slowdown, how big are the files you have open? Are they a specific encoding? Are they saved on an external drive?
Just plain text files, nothing out of the ordinary. Saved on an internal SSD.
I had the exactly the same issue that @crom5 illustrated in the video. Since some time, however, when I click on files in the file manager they open in separate Gedit instances instead of using the same Gedit instance but with multiple tabs. Were there any changes made during the past days? It looks like it could be circumvented like this but now I feel that separate Gedit instances are less preferable than actually having multiple tabs.