I try to reproduce the behavior and maybe I was wrong to blame the Clipboard History. I think there is another bug, that cause my issues: My database output is normally without line breaks. If I paste this 60 MB single-line JSON-data into TM it crashes. Or to be exact: TM 2.06: It allow pasting. But after this one CPU-Core is at 99.4-100% forever. So it goes this way: ---Click-TM-Window--FREEZE30s---CursorToAnotherPosition--FREEZE20s---TryToMoveBottomSideBar---FREEZE30s--- and so on. Working is not possible, but TM is not really crashing. If I take the same file, but with line breaks (like JSON beautify), all works as expected.
TM 2.15: Instead of TM 2.06 opening a single-line-file with 80 MB is not possible. TM is frozen while CPU is 99.9% for minutes (I stopped after 10 minutes). Working with a file with line breaks all behaves normally, no matter how large it is. It is possible to transform a line-break-file to a single-line-file(Find&Replace or Unwrap Paragraph). The transform takes 3 minutes (then I can see the single-line-text), but then it takes 2 minutes until I can set the cursor. But working is not possible: After every action (text selection, cursor placing,.. ) TM freezes for 10 or more seconds: e. g. if I insert one character near the end of this 80 MB single-line-file it takes 10 seconds until I see the typed "5" and 74 seconds until TM is ready to make the next action.
The RAM capacity is normal in every case. Only the 100%-CPU causes these issues. If a large single-line-file is open, CPU is instantly at 99% and stays there while it is not in the background. Even if I go away from the computer: always plus 99% (tested 40 minutes).