[Opera-Linux] How to reload faster?

[Daniel Eckl]

I now tried this. Going back to digg.com takes about 2 seconds for me.
I'm running on a Dual Core 1,8 Ghz. If your CPU is slower, it might take
longer to render the content, so 5 to 10 seconds sounds possible.

I traced my network traffic with wireshark and I I found out that one
thing is being transfered when going back: A hit counter image from
another server of digg.com. This image is being transfered with these
HTTP Response Headers:
Date: Sat, 09 Jun 2007 09:43:01 GMT
Cache-Control: no-cache, private, must-revalidate
Pragma: no-cache
Expires: Sat, 09 Jun 2007 09:43:02 GMT
(as you can see, the expiration date is on second after the response)

So it's wanted that a browser fetches this image every time.
Now I think that a history back action is thought to fetch EVERYTHING
from the cache to be able to show the exact state you saw when you
visited it. But now there's a dilemma: Opera is not allowed to cache
this image when it first gets it. But when you go back in history, opera
is supposed to show it to you...

So this would give three options:
1: Fetch it again from the source URL
2: Not show this image at all when going back in history
3: Always cache everything opera loads, even when the server does not
allow to.
4: Cache these kind of content just in memory.

At the moment opera seems to use option 1.
Option 2 could lead to lots of angry support queries if visible content
it missing because of that. Not wanted.
For privacy and security reasons, option 3 is not a real option. If
server sais "don't cache", then opera is supposed to exactly do so. The
content marked this way might contain private information that no
attacker should be able to read from your harddisk.

But I think option 4 doesn't sound that bad. Caching this content in
memory only should be rather safe. Well you can be attacked with a
rootkit which is able to read from your RAM (well I'm not a security
expert but this sounds plausible to me) but if you have such a problem,
then all your traffic and all your keystrokes are compromised as well
anyway.

I think this would be a good option to handle this kind of content.
Is there any opera dev who can comment on this? Is there any drawback I
didn't think of? Is this doable or even planned already?

Best,
Daniel

Larry Alkoff schrieb:
> Daniel Eckl wrote:
>   
>> Hmmmmm okay, this way we excluded wrong version as well as wrong settings...
>>
>> I ran out of ideas now, but perhaps not the opera devs. Could you give
>> us some easily accessable example URLs, where the devs can try to
>> reproduce that?
>>
>> Best,
>> Daniel
>>     
>
> Open http://digg.com/ in Opera.
> Click on an article, then use the back button or z to return to the digg 
> first page.  It takes me 5-10 seconds and seems like it's reloading from 
> the internet, not from cache.
>
> Larry
>
>