[PyQt] Attempting to reduce the memory footprint of my PyQt5 application

[Xavion]

Thanks for all of the help and insight, guys.  I wasn't expecting to get
such informative responses.  I will look into the methods and tools you've
suggested, and go from there.  I will let you know if I have any follow-up
questions along the way.

Some Asian guy had reported a nasty memory leak in my application a while
ago.  It was still in PyQt4 form at the time.  I wasn't able to reproduce
the leak here.  The language barrier, and lengthy delays between responses,
made it difficult to request more information from him.

When I revisited the problem recently, the first logical step was to avoid
loading unnecessary PyQt modules.  I wanted to eliminate that as a
potential cause before spending more time interrogating my code.  I didn't
want to be sending myself on a wild goose chase in the event that PyQt was
responsible.
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