Just a quick note to say that my Windows 8.1 system has 16gb of RAM and Sigil exhibits most of the problems that brent63 has, although I have noticed that embedded fonts seems to be the main culprit. Without embedded fonts, I can usually edit for approximately an hour before I need to close Sigil and restart it, but with embedded fonts I'm lucky to get 15 minutes. And, like brent63, closing the Preview window seems to help.
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