(I would give you the exact Unity version, but Unity has just thrown a fit and I can't. 2020.1.4 something or other. I have a project that needs to create thousands of objects. I have tried every way to do this I've found, so far everything has awful limitations. But this bug report is for the Hold On box which gets displayed if ANY loop of ANY design is working and busy for more than 2 seconds. I don't mind the hold on box itself, the problem is it never lets go, control is never returned to the editor, my code never gets the chance to finish. So if you have a long loop your only escape is to terminate the Unity process. Doing this over and over again is A LONG way from ideal and this afternoon has totally corrupted my project, which I'm about to start repairing. This box is stupid and somewhat pointless. If it has to be there please make it work. If it doesn't HAVE to be there please remove it. From a users point of view it's pretty obvious if the editor is busy.