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Thank you so much for responding!
It is seldom seen that a developer of an application so popular as yours can find the time to be so interactive with their users.
Of course, that gratitude extends to the users above as well!
I don't know yet if it is out of bounds to reply to each and every tip so I just crammed it in to one reply.
I've found some Chrome settings that hinted at GPU acceleration and disabled them (below).
There were more GPU settings but they were related to camera and logging so I ruled them out as a possible culprit.
Alas, changing these did not help.
I'm running an export at the moment, just to be on the safe side.
After that finishes I will completely remove both applications.
Then, reinstall and try to start with a new library of ~100 epubs to rule out possible issues with the database or settings.
I was planning to make a backup of calibre settings and metadata.db and remove them from the export directory in order to rebuild from file.
Just checking the export directory (it's at 29% atm) I see that it contains to 20 1GB partxxx.calibre-data files so that probably will not work.
So, after the export I will use "Save to Disk" to create another backup to rebuild the database from file.
Given that it's 60.000 titles spread over 500.000 files totalling at 250GB, it should take a while.
In the original rar files I found there were 75.000 titles.
Since then, I have been trying to delete all erotic women's fiction.
Being a middle aged man, I never knew that there were so many books written in that genre, let alone would I expect to have them in my possession.
Furthermore, I also did know that, apart from so many "shades" of bondage, vampires and werewolves were so sexually appealing to women.
Well, live and learn.
I have been trying to be smart in the 'censoring' process and after selecting by keywords in titles and description, tags and authors I had no more tricks up my sleeve.
This helped me removing about 12.000 titles but the library is still riddled with them.
The process of deletion left me feeling like an old 1950's Puritan Church lady and after a long session flashing images of muscly bare chested men, some sporting fangs, still haunted me.
I will leave that for another topic to see if the community can come up with some smarter filters I, namely going through the covers.
In the meantime, I would really appreciate any help with your advise of disabling GPU hardware acceleration.
I work in IT but it has been a very long time since that work was actually hands-on.
I feel stupid and ashamed that I did not get this working.
The Google Chrome flags settings (that did not help):
Accelerated 2D canvas
Enables the use of the GPU to perform 2d canvas rendering instead of using software rendering. – Mac, Windows, Linux, Chrome OS, Android
#disable-accelerated-2d-canvas
GPU rasterization
Use GPU to rasterize web content. – Mac, Windows, Linux, Chrome OS, Android
#disable-gpu-rasterization
Zero-copy rasterizer
Raster threads write directly to GPU memory associated with tiles. – Mac, Windows, Linux, Chrome OS, Android
#disable-zero-copy
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