84286 - [RFE] Save complete document in cache instead of source for better performance (Cache DOM & Layout)

Status: RESOLVED DUPLICATE of bug 38486

(Core :: DOM: Navigation, enhancement)

Description

[patrick]

When you use the back button to revisit a previous page and you have left the
previous page at the bottom, then the previous page is first displayed from top
and only later scrolled down to the bottom where one has left it before.

Steps to reproduce:
Go to http://www.spiegel.de
Scroll down to the bottom
Select an article
On the new page, hit the back button

Result:
The browser loads the previous page from the cache (which is horribly slow)
The page is rendered top to bottom and the top is at first displayed
As soon as the bottom is ready, the page scrolls down automatically, leading to
a visible jump.

Expected result:
The browser loads the screen representation of the previous page from the cache
(which can be horribly fast)
The page is instantaneously displayed the same way you left it without visibly
jumping from top to bottom.

Check Opera for how they are doing it.

Comment 1

[gordon]

This is more closely related to session history.  It's not a cache bug.  Changing 
component and owner.

Comment 2

[Keyser Sose]

Not an enhancement

Comment 3

[Keyser Sose]

WORKSFORME
Platform: PC
OS: Windows NT
Mozilla Build: 2001062815


Marking as such.

Comment 4

[patrick]

Sorry, doesn't work at all. Just tried 2001071604 build on NT.

The page is rendered from scratch and displayed top-bottom. Once the previous position is reached again, the display jumps down.

I don't know if you don't see it on a 1 GHz machine because everything is so quick, but on my PII it is very, very disturbing. Again, I recommend comparing with Opera. Very smooth, no jumps. I assume they don't cache the HTML but the final rendered representation of the page, so they don't have to do it again.

reopened bug

Comment 5

[Keyser Sose]

marking NEW.

Comment 6

[Radha on family leave (not reading bugmail)]

To get the desired effect, mozilla needs to cache the entire document instead of
just the source and other stuff like form values and scroll positions, (which it
does right now). This is a major feature. This feature doesn't belong to Session
History either. But not sure where it should go. Giving it to Jud for now. 

Comment 7

[Caspy7]

This bug sounds very similar to Bug 111036, should one of these get duped?

Comment 8

[Christopher Hoess (gone)]

*** Bug 111036 has been marked as a duplicate of this bug. ***

Comment 9

[Adam Hauner]

Marc, should be this moved to Layout (where duped bug 111036 assigned to you
belongs)?
(Changing bug properties regarding dupe)

Comment 10

[Jesse Ruderman]

*** This bug has been marked as a duplicate of 38486 ***

Comment 11

[Brant Gurganus]

[RFE] is deprecated in favor of severity: enhancement.  They have the same meaning.