MobileRead Forums - View Single Post - Are there CSS-Statements that slow everything down?

Cyberman tM · 05-19-2011, 02:50 PM

I know that question doesn't make much sense without context, but bear with me.

I know that in HTML, some CSS statements/functions can cause a serious slow-down of the system. Usually anything that forces a re-render of the page flow.
These shouldn't happen in ePub, I suppose?

Are there other statements that can cause a slow-down? Or that should be avoided?

I realize this will depend highly on what system is rendering the ePub - but perhaps there are CSS commands that all systems have problems with?

Point in case, I'm having trouble reading ePubs from O'Reilly on my Kobo. They're beautifully designed and rendered, but chapter-turns take ages, while font resizes cause a system freeze.
It has been suggested in this thread that I replace the CSS with a default file from Calibre.
I tried it and indeed it was MUCH faster. But of course I lose the special formatting.

So now I'm thinking perhaps the CSS can be - "slimmed down" to a more palatable size. Or at least be freed from a few indigestable lumps.

Suggestions, ideas?

05-19-2011, 02:50 PM	#1
Cyberman tM Evangelist Posts: 439 Karma: 2248782 Join Date: Aug 2009 Location: Austria Device: Inkbook Prime; Icarus Illumina;ImcoV6l;EB600;Kobo	Are there CSS-Statements that slow everything down? I know that question doesn't make much sense without context, but bear with me. I know that in HTML, some CSS statements/functions can cause a serious slow-down of the system. Usually anything that forces a re-render of the page flow. These shouldn't happen in ePub, I suppose? Are there other statements that can cause a slow-down? Or that should be avoided? I realize this will depend highly on what system is rendering the ePub - but perhaps there are CSS commands that all systems have problems with? Point in case, I'm having trouble reading ePubs from O'Reilly on my Kobo. They're beautifully designed and rendered, but chapter-turns take ages, while font resizes cause a system freeze. It has been suggested in this thread that I replace the CSS with a default file from Calibre. I tried it and indeed it was MUCH faster. But of course I lose the special formatting. So now I'm thinking perhaps the CSS can be - "slimmed down" to a more palatable size. Or at least be freed from a few indigestable lumps. Suggestions, ideas?