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Just happened again [0] and no amount of app killing helps.

I ran heap(1) on WindowServer [1] but there's nothing in there standing out so maybe this is a red herring.

[1] https://gist.github.com/772687dba65a35cca8cd707fcfda99c0

Not a red herring, just confirming it wasn't a normal application memory leak (it's not, the malloc usage is fine–I think you're hitting the same issue as is mentioned in this article). The next step I would do is run sudo footprint $(pgrep WindowServer), optionally with -v to give you a really detailed list of why the footprint is so high.

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