Editor becomes sluggish

Karellen · 07-28-2025, 03:44 AM

Hi again @kovidgoyal

I first installed v8.2, then updated to v8.5, which I am still on. (I don't install every update, maybe every second or third release) Ever since updating to the v8 line, I have experienced the Editor becoming very sluggish.

Sometimes I need to step through Regex Search and replace instead of change all. This opens xhtml sheets as I step through. As I am stepping through, I might spot other issues and quickly fix them.

I might have, say, 30 pages open. The editor then becomes very sluggish. Trying to move the cursor using arrows, and it takes a second or two for it to move. Trying to type (I type 50wpm) and the letters appear very slowly, maybe upto a second between letters.

I can then flip to other running programs on my pc, and everything is normal. Flip back to Calibre Editor and it is sluggish. If I flip to Calibre library and, say, edit metadata on a book it is not sluggish, but there is a very slight jerkiness when typing. I then need to close all the pages, close the editor, then re-open it and continue with my edits until it happens again.

I haven't seen anybody else report this. Any idea what could be causing this? What other info can I provide?

PC is i7-10700K, 32GB RAM running Win11

Thanks.

kovidgoyal · 07-28-2025, 07:10 AM

First reboot into safe mode and see if the the sluggishness still happens.

Karellen · 07-28-2025, 03:15 PM

Reboot Windows into safe mode? Not restart Calibre in debug mode?
Ok, will do.

JSWolf · 07-28-2025, 11:13 PM

The problem is this efficiency mode. Get out of it. Because QT uses Chrome, the system thinks it's a Browser and sets it

JSWolf · 07-29-2025, 02:31 AM

No need for safe mode. This stupid efficiency mode is slowing down calibre.

rwmcafee · 07-30-2025, 07:44 PM

THANKS Jon!!!

The e-book viewer loaded just as fast as it did on Windows 7.

Just checked out the editor and it's fast again.

Again Thanks.
Ron

JSWolf · 08-10-2025, 01:08 PM

Quote:

Originally Posted by rwmcafee

THANKS Jon!!!

The e-book viewer loaded just as fast as it did on Windows 7.

Just checked out the editor and it's fast again.

Again Thanks.
Ron

Happy to help.

07-28-2025, 03:44 AM	#1
Karellen Wizard Posts: 1,687 Karma: 9500498 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Editor becomes sluggish Hi again @kovidgoyal I first installed v8.2, then updated to v8.5, which I am still on. (I don't install every update, maybe every second or third release) Ever since updating to the v8 line, I have experienced the Editor becoming very sluggish. Sometimes I need to step through Regex Search and replace instead of change all. This opens xhtml sheets as I step through. As I am stepping through, I might spot other issues and quickly fix them. I might have, say, 30 pages open. The editor then becomes very sluggish. Trying to move the cursor using arrows, and it takes a second or two for it to move. Trying to type (I type 50wpm) and the letters appear very slowly, maybe upto a second between letters. I can then flip to other running programs on my pc, and everything is normal. Flip back to Calibre Editor and it is sluggish. If I flip to Calibre library and, say, edit metadata on a book it is not sluggish, but there is a very slight jerkiness when typing. I then need to close all the pages, close the editor, then re-open it and continue with my edits until it happens again. I haven't seen anybody else report this. Any idea what could be causing this? What other info can I provide? PC is i7-10700K, 32GB RAM running Win11 Thanks. Attached Thumbnails Last edited by Karellen; 07-28-2025 at 04:01 AM.

07-28-2025, 03:15 PM	#3
Karellen Wizard Posts: 1,687 Karma: 9500498 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Reboot Windows into safe mode? Not restart Calibre in debug mode? Ok, will do. Last edited by Karellen; 07-28-2025 at 03:19 PM.

07-28-2025, 11:13 PM	#4
JSWolf Resident Curmudgeon Posts: 80,746 Karma: 150249619 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	The problem is this efficiency mode. Get out of it. Because QT uses Chrome, the system thinks it's a Browser and sets it Last edited by JSWolf; 07-28-2025 at 11:25 PM.

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07-28-2025, 07:10 AM	#2
kovidgoyal creator of calibre Posts: 45,604 Karma: 28548974 Join Date: Oct 2006 Location: Mumbai, India Device: Various	First reboot into safe mode and see if the the sluggishness still happens.

07-29-2025, 02:31 AM	#5
JSWolf Resident Curmudgeon Posts: 80,746 Karma: 150249619 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	No need for safe mode. This stupid efficiency mode is slowing down calibre.

07-30-2025, 07:44 PM	#6
rwmcafee Connoisseur Posts: 57 Karma: 2024 Join Date: Apr 2011 Location: Southern Idaho Device: Samsung Galaxy Tabs	THANKS Jon!!! The e-book viewer loaded just as fast as it did on Windows 7. Just checked out the editor and it's fast again. Again Thanks. Ron

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