bug#24091: 24.5; High CPU usage at startup while hidden

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Eli Zaretskii <eliz@gnu.org> writes:

>> From: Ken Raeburn <raeburn@raeburn.org>
>> Given that we
>> should redraw things on expose events anyway, I’m not sure it'll
>> matter, unless someone’s following up a call to make-frame-visible
>> with some other action that needs to be delayed until after the
>> window is actually visible.

Do we know about any operations that require the frame be visible?  What
happens when they're run with an invisible frame?  Error?  Corrupted
display?  Hang?