Details
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Bug
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Resolution: Incomplete
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P2: Important
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None
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5.15.2
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None
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Slackware-current
Linux 5.12.0
Plasma 5.21.4, KDE frameworks 5.81.0
Qt 5.15.2
NVIDIA Driver Version: 460.73.01 (got the same problem using Nouveau driver, too)
GPU: GeForce GT 710
Description
QTWEBENGINE_CHROMIUM_FLAGS="--enable-logging --log-level=0 --v=1" calibre-debug -w *.epub
takes several seconds to initialize 6 script contexts, throwing "ERROR:paint_controller.cc(646)" and "A context is created NOT from snapshot" errors and destroying then recreating contexts (multiple "Destroyed context for extension" before everything is setup and ready for rendering HTML). Also, --disable-gpu doesn't speed things up.
See the attached logs comparing Calibre's ebook-viewer's vs. quicknanobrowser's loading/initialization times.