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That bug.qml testcase in the second Qt bugreport I cited, is a good way to test for memory leakage due to resizing a QWebEngineView.
That said, if only your machine displays this strange behaviour, it is more than likely the bug is in your gpu video driver, not Qt. A Qt bug would happen on all platforms using that architecture.
Also, I agree with DiapDealer, if you are seeing a serious slowdown after disabling the gpu in Sigil Preferences and then restarting Sigil, then something specific to your system/driver setup is indeed broken. Sigil does not really make much use of the gpu for an epub (ie. it is not a video game).
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