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#1 |
Enthusiast
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Join Date: Nov 2010
Device: none
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EPUB files take long time to open
Hi all, I tried searching the web for a solution to no aid. Issue is that EPUB files (an ebook file format) take a very long time to open, and even after opened, browsing pages inside the epub is slow. It does not matter if I open the book with Calibre or SumatraPDF, I even tried different extensions inside Firefox or Edge, it's always slow, sometimes taking up to 2 or 3 minutes to open, and SumatraPDF sometimes not even opening and staying in task manager as a high CPU process forcing me to terminate it. Disabling Windows Defender is of no help and changing the Graphics Performance preference (GPU assisted or disabled) does not fix it. I'm using a Dell XPS Windows 10 laptop. Thanks for any hint.
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#2 |
Grand Sorcerer
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Karma: 74358018
Join Date: Nov 2007
Location: Toronto
Device: Libra H2O, Libra Colour
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How large are the individual XHTML files inside the Epub?
Sent from my Pixel 7a using Tapatalk |
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#3 |
Enthusiast
![]() Posts: 44
Karma: 10
Join Date: Nov 2010
Device: none
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#4 |
Resident Curmudgeon
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Karma: 134319570
Join Date: Nov 2006
Location: Roslindale, Massachusetts
Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3
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Is your computer slow?
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#5 |
the rook, bossing Never.
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Karma: 89531599
Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
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Something somewhere is broken if the Calibre Viewer does this with every epub.
I've only used Sumatra for PDFs. I have a 2016 laptop with Win10 and it's pretty instant to open epubs with Calibre viewer. A browser is madness. |
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#6 |
Connoisseur
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Karma: 502864
Join Date: Mar 2021
Device: Kindle Voyage
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I had issues with one version of Sumutra (can't remember which because I deleted it).
But SumatraPDF-3.3.3-64.exe and the prelease work fine. As a comparison, they load Pickwick Papers (953 pages) (see https://www.gutenberg.org/ebooks/580.epub3.images ) in less than a second for version 3.3.3 . This is on my 5 year old Windows 10 machine. Calibre Viewer on the other hand has always been slow and takes about 10 seconds before anything appears to happen and another 5 seconds until I can start reading. |
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#7 |
Grand Sorcerer
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Karma: 227000000
Join Date: Jan 2014
Location: Estonia
Device: Kobo Sage & Libra 2
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Calibre Viewer became slow when the version 4.x was introduced and the viewer was completely rewritten. Before that the viewer was pretty snappy. For this reason I still use the viewer from 3.48 (Calibre itself is current).
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#8 | ||
the rook, bossing Never.
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 12,235
Karma: 89531599
Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
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Quote:
Quote:
Something is broken. 120 to 180s seconds vs 15s is x10 slower. My 2017 Dell Optiplex 7050 takes 7 s first time, 3 to 4s subsequent. (SSD for OS, SATA HDD for user files). The 2016 Win10 laptop is certainly slower as it's got no SSD. But faster than opening Firefox or Word the first time. Calibre 7.8 Last edited by Quoth; 04-28-2024 at 05:19 PM. |
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#9 |
want to learn what I want
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Karma: 6425162
Join Date: Sep 2020
Device: Calibre E-book viewer
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Sumatra can't be slow on any well-functioning system. I wonder what happens in Windows Safe Mode
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#10 |
Grand Sorcerer
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Karma: 74358018
Join Date: Nov 2007
Location: Toronto
Device: Libra H2O, Libra Colour
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I wonder what is the source of the Epub?
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#11 |
Wizard
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Karma: 6700678
Join Date: Sep 2021
Location: Australia
Device: Kobo Libra 2
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Maybe its one of those ebooks where there is no text, rather it contains large sized tiffs of the scanned pages.
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#12 |
Grand Sorcerer
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Karma: 227000000
Join Date: Jan 2014
Location: Estonia
Device: Kobo Sage & Libra 2
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#13 | |
Enthusiast
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Karma: 10
Join Date: Nov 2010
Device: none
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No, my computer is perfectly fine, everything snappy and optimized for high performance (no unnecessary processes in the background, minimal scheduled tasks and services, etc). Dell XPS 9710 with high specs.
Quote:
How can you update Calibre to latest version while keeping an older version of the viewer? Also, any way of downloading the Viewer from version 3.48 so I can test it? I was able to download Calibre v3.48 but not the viewer as a standalone. Thanks Last edited by betelguese; 04-28-2024 at 06:54 PM. |
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#14 |
null operator (he/him)
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Karma: 27620684
Join Date: Mar 2012
Location: Sydney Australia
Device: none
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@betelguese - try Thorium or Azardi, in my experience they're both faster than the Calibre viewer. Haven't used Sumatra for decades.
BR |
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#15 | |
Grand Sorcerer
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Karma: 227000000
Join Date: Jan 2014
Location: Estonia
Device: Kobo Sage & Libra 2
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