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Old 10-04-2019, 12:04 PM   #1
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Calibre 4: guzzling CPU even when not running
Today after I updated to Calibre 4, I noticed my fans running louder than before.

Looking at task manager, I found three instances of "Qt QtWebEngineProcess (32 bit)" running, each using roughly 16% of my CPU (i5 9600k six-core at 3.7GHz CPU).

When I access the process properties via the context menu, these processes show this location "C:\Program Files (x86)\Calibre2\app\bin". The processes remain running even when I close Calibre.

Has anybody else got a similar experience? Does anyone know why this is happening? If this is some kind of library optimisation process which will make the software run better in future, I will go along. Otherwise, I will surely downgrade - I want my PC to be silent when idle.
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Old 10-04-2019, 12:12 PM   #2
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Quote:
Originally Posted by Braid View Post
Today after I updated to Calibre 4, I noticed my fans running louder than before.

Looking at task manager, I found three instances of "Qt QtWebEngineProcess (32 bit)" running, each using roughly 16% of my CPU (i5 9600k six-core at 3.7GHz CPU).

When I access the process properties via the context menu, these processes show this location "C:\Program Files (x86)\Calibre2\app\bin". The processes remain running even when I close Calibre.

Has anybody else got a similar experience? Does anyone know why this is happening? If this is some kind of library optimisation process which will make the software run better in future, I will go along. Otherwise, I will surely downgrade - I want my PC to be silent when idle.
Nothing here (returns to 0CPU after a brief 'poll cycle'). Task manager says power usage 'very low' during Calibre idle (me not using it)
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Old 10-04-2019, 12:26 PM   #3
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Those are browser processes used by the viewer and editor. calibre itself does not use them oonly the viewer and editor do. And they definitely should bnot be persisting. If a reboot does not cler up the problem then it is likely something is interfering withthem, try running in safe mode first.
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Old 10-04-2019, 11:53 PM   #4
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I tried opening 3 books in the viewer and got 6 instances of Qtwebengineprocess running (two per instance of the ebook viewer). TaskManager showed CPU use for all three instances of the ebook viewer at 0%. When I closed the 3 instances of the ebook viewer, the Qtwebengineprocess closed with them.
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Old 10-05-2019, 01:55 PM   #5
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Quote:
Originally Posted by kovidgoyal View Post
Those are browser processes used by the viewer and editor. calibre itself does not use them oonly the viewer and editor do. And they definitely should bnot be persisting. If a reboot does not cler up the problem then it is likely something is interfering withthem, try running in safe mode first.
Thanks. A reboot did get rid of the processes, and I ran Calibre a few times yesterday and the problem didn't occur again. However, it has happened to me again just now - three instances of the same Qtwebengineprocess, each using roughly 16% of my CPU.

Let's see if it happens with anyone else.
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