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I may have been lucky enough to just have focus someplace else. Opening Preview should not change your timings by much.
If you can recreate this slowdown in launching preferences on Linux, try running gdb and when the beach ball or hang starts, hit crtl-c to interrupt gdb and get a copy of all backtraces of all threads. Then use gdb to hit C for continue, and wait a second or two and interrupt it again. Then again print out the backtraces of all threads. Find the thread that has not progressed much across the two sets of backtraces (that is actually doing something or trying to). That will help show us what is happening at this time.
If you get a chance, zip up the two outputs and e-mail me. I will try the same thing under macOS if I can get the big delay after loading to happen.
Once we see where things are stuck, we will have a better idea of how to fix it.
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