Viewer is slow - sometimes never opens book

jecilop · 02-03-2022, 11:02 AM

Since Calibre was updated to become more web based in the function (I believe it was) (major code change), I have had problems viewing books. Of note, I use epub format.

Prior, I could open 10 at a time rather quickly.

Now, I often can't even get one to open.

It will sit on "Preparing for 1st view" for 5 minutes or more, sometimes never actually getting to the view. And I certainly cannot open more than one simultaneously (ie, one must finish opening if my luck is good before I can attempt to view another). If I don't, it yields an error of "not finding" a book and yields the same error then on the 1st I tried to open).
This is being used on a PC and not a server.

Do I need to do something in settings?

It has been so frustrating for some time now as I lost a major functionality of Calibre for my purposes in my very large library. Again, it only started once the big switch was made in the software to concentrate on web server functionality. (This description is my phrasing of how I remember it.)

I've been wanting to ask for awhile, but I kept thinking updates would fix it giving it time to work the kinks out of a new code.

kovidgoyal · 02-03-2022, 11:09 AM

Try rebooting windows in safe mode and see if your problem goes away.

theducks · 02-03-2022, 11:13 AM

Be sure to whitelist your LIBRARY folder in your A/V. (all books have to pass thru a download place that SHOULD be auto scanned, proving they are OK to import).

Sarmat89 · 02-03-2022, 01:04 PM

It happens without antivirus too. Very annoying.

theducks · 02-03-2022, 03:15 PM

Quote:

Originally Posted by Sarmat89

It happens without antivirus too. Very annoying.

I normally see 30-45 seconds for normal - Large (<2M) books.
I can't imagine needing to open 10 at a time (and I have 16G RAM)

You might want to watch what is being used (Task Manager: Processes) to make it take 5 Min.

BTW Have you run a full Memory (eg Memtst86)test? Some of your RAM may be acting up.

BetterRed · 02-03-2022, 03:27 PM

@jecilop - Maybe it's the books.

Try downloading the following and viewing it. For me it opened within 5 secs first time, and 2 secs on second and subsequent reads.

Calibre User Guide - EPUB format

I use MS Defender with no exclusions on latest Win 10, and I index the drive I put in on, including an EPUB iFilter.

BR

Sirtel · 02-03-2022, 03:42 PM

I still use the 3.48 viewer for exactly this reason. The viewer from 4.xx onward is much slower in opening books for the first time and this would seriously hamper my workflow (I usually open a book in the viewer to check the formatting).

Note I only use the old viewer, not an old Calibre version. Calibre itself is the latest.

02-03-2022, 11:02 AM	#1
jecilop Addict Posts: 260 Karma: 139980 Join Date: Mar 2014 Device: Android	Viewer is slow - sometimes never opens book Since Calibre was updated to become more web based in the function (I believe it was) (major code change), I have had problems viewing books. Of note, I use epub format. Prior, I could open 10 at a time rather quickly. Now, I often can't even get one to open. It will sit on "Preparing for 1st view" for 5 minutes or more, sometimes never actually getting to the view. And I certainly cannot open more than one simultaneously (ie, one must finish opening if my luck is good before I can attempt to view another). If I don't, it yields an error of "not finding" a book and yields the same error then on the 1st I tried to open). This is being used on a PC and not a server. Do I need to do something in settings? It has been so frustrating for some time now as I lost a major functionality of Calibre for my purposes in my very large library. Again, it only started once the big switch was made in the software to concentrate on web server functionality. (This description is my phrasing of how I remember it.) I've been wanting to ask for awhile, but I kept thinking updates would fix it giving it time to work the kinks out of a new code.

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02-03-2022, 11:09 AM	#2
kovidgoyal creator of calibre Posts: 43,858 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Try rebooting windows in safe mode and see if your problem goes away.

02-03-2022, 11:13 AM	#3
theducks Well trained by Cats Posts: 29,803 Karma: 54830978 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Be sure to whitelist your LIBRARY folder in your A/V. (all books have to pass thru a download place that SHOULD be auto scanned, proving they are OK to import).

02-03-2022, 01:04 PM	#4
Sarmat89 Evangelist Posts: 482 Karma: 2267928 Join Date: Nov 2015 Device: none	It happens without antivirus too. Very annoying.

02-03-2022, 03:27 PM	#6
BetterRed null operator (he/him) Posts: 20,570 Karma: 26954694 Join Date: Mar 2012 Location: Sydney Australia Device: none	@jecilop - Maybe it's the books. Try downloading the following and viewing it. For me it opened within 5 secs first time, and 2 secs on second and subsequent reads. Calibre User Guide - EPUB format I use MS Defender with no exclusions on latest Win 10, and I index the drive I put in on, including an EPUB iFilter. BR

02-03-2022, 03:42 PM	#7
Sirtel Grand Sorcerer Posts: 10,130 Karma: 224760044 Join Date: Jan 2014 Location: Estonia Device: Kobo Sage & Libra 2	I still use the 3.48 viewer for exactly this reason. The viewer from 4.xx onward is much slower in opening books for the first time and this would seriously hamper my workflow (I usually open a book in the viewer to check the formatting). Note I only use the old viewer, not an old Calibre version. Calibre itself is the latest.

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