So I've shrinked the Light Blue button which triggers if the window should be always visible and putted a little white box saying 'Norm'. For 'Normal'. Clicking the box will change the mode to 'slow'. What this actually does, is that is shinks the amount of times the program calculates the new time. So that means it uses less CPU in this mode, and also solves the problem described above.
I've also renamed the Simple Stopwatch to Taskbar Stopwatch, to make more clear what is the special thing of the program instead of saying it's just simple. There're also a lot of other different 'Simple Stopwatches' on the internets, so I'm more unique with this name.
There are also some tiny fixes and YoYoGames that has placed an evil banner if you close the stopwatch. So please ignore that. :)
I'm offering the Stopwatch now only in a ZIP-file because it doesn't has to write files and saves your memory. You can unzip it if you just want to have the executable.