Created attachment 133472 [details]
Cpu running all cores.

SUMMARY
This is a fresh install of Mint 20 Cinnamon 64bit. 
Running an i7 guad core processor w/ turbo boost to 4GHz.  
Now and then the solver will run all 8 processors at 4Ghz max.  Some times for as long as 30 seconds or more.   

STEPS TO REPRODUCE
Simply just load and pick a game.  Normally the more complex games, like Mod3 or Yukon have a higher rate of displaying this issue.

OBSERVED RESULT
Oddly I observed when playing mod3 I had a choice of 2 Jack of spades to put on a pile.  Both jacks in the top line so it made no difference which I picked, they both would go on top of the 8 and both free a hole.  But one failed and one did not.  
Also as the game progresses, the symptoms diminish.  Not unexpectedly since there are less choices to test.   
Sometimes I can back up and then 'redo' the move and it solves faster.   Normally I just assume it's having a hemorrhage and there is no solution so I 'undo' the move. 

In Mint 19.3 I had a lag for the solver but never more than 10 seconds. And usually it was 'cannot determine if there is a solution' or whatever the wording is.  A delay usually meant it was not a good move.   Now it's just taking time even to say it's still a winnable game. 

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION