There seems to be related to page size. We are definitely not altering cursor or scrolling behaviour.

I noticed lag on scrolling on larger pages (ones 1mb or over)
I noticed by removing all javascript the page scrolling is slightly quicker but still slow on long pages due to the vasts amount of content.

My suggestion would be that this is best solved by addressing Bug 31011

bugzilla_wikimedia wrote:

(In reply to comment #1)

There seems to be related to page size.

I attempted loading the desktop version of Wikipedia on my E75 by clicking the 'Desktop version' link at the bottom of the page. Although it took much longer to load, the scrolling is normal there. Also other large websites (including pages of 1mb or over) have normal scrolling. Perhaps not a fast response time, but a normal scrolling distance per click.

The page used as test case was en.wikipedia.org/wiki/Knife

I noticed by removing all javascript the page scrolling is slightly quicker but
still slow on long pages due to the vasts amount of content.

In the settings I tried disabling 'Java/ECMA-script' (basically Javascript) and clicked the 'Mobile view' at the bottom of the page (since the desktop view was still on from the previous test). Loading was not faster, but the problem disappeared.

If I may ask, do you own a Nokia E75 or other Symbian s60v3 device without touchscreen (if there are any)? If not, how did you test this?

My suggestion would be that this is best solved by addressing Bug 31011

This may help against lag, but I personally do not think it will help the scrolling distance per click.

Thanks for the feedback. Interesting that the javascript would have an effect on the scrolling. I'm not quite sure yet why this might be but I will continue to investigate and see if I can work out the cause.

Currently I'm limited to testing via an emulator using Nokia developer tools - http://www.developer.nokia.com/Devices/Remote_device_access/

I will have a few more experiments and see if I can replicate this better, if possible on a real device.

I got E51 and this is WFM.

It takes same 15 keypresses(if dont hover images/links on my path) to make go 1 page up/down, with/without Javascript, both on mobile/desktop views on the Knife article fully loaded showing all sections.

Prolonged scrolling gives a zoomed out view during which the scrolling is slower OR traversing through images/links makes it slower than normal, but this is symbian browser's feature and I guess you are not citing that.

If you could tell me more specifically how to test to detect slowness, I could help :) //Glad to see some symbian interest :) :)

@Luc, Did you find scrolling slow on Opera mini / mobile browsers too?

@Jon, you should have E75 once you are in SF :)

bugzilla_wikimedia wrote:

(In reply to comment #3)
Thank you :)
I can always try things on my device if you can put up a test page somewhere (or give a downloadlink, then I'll host locally myself).

(In reply to comment #4)

I got E51 and this is WFM.

I see that's Symbian s60v3 too, odd you don't have this problem. What software version do you have? ('Dial' *#0000#). Mine is 202.12.01, dating from 14-12-09. "Changed version" is 202.12.01.236.04, dating from 06-01-10.

It takes same 15 keypresses(if dont hover images/links on my path) to make go 1
page up/down, with/without Javascript, both on mobile/desktop views on the
Knife article fully loaded showing all sections.

About 12 clicks without Javascript, 23 clicks with (both in landscape mode). The odd thing is that this only occurs when scrolling, not when moving the cursor around the screen. Prolonged scrolling works normal.

It doesn't matter whether the screen is in landscape (qwerty-keyboard opened) or portrait mode (holding it upright with keyboard closed). Also scrolling up or down makes no difference.

Prolonged scrolling gives a zoomed out view during which the scrolling is
slower OR traversing through images/links makes it slower than normal, but this
is symbian browser's feature and I guess you are not citing that.

This works normal. I turned the page overview (zoomed out view) off in the settings to make this much faster though, but I don't think that is relevant to this problem.

If you could tell me more specifically how to test to detect slowness, I could
help :) //Glad to see some symbian interest :) :)

I think your test of how many clicks it takes is a very good way, only it doesn't seem to occur on your device (as you said with and without Javascript both takes 15 keypresses).
(And I too am glad someone is actually picking this up, hadn't really expected that!)

@Luc, Did you find scrolling slow on Opera mini / mobile browsers too?

The problem does not occur in Opera Mini or UC Browser. Only Symbian's default browser.

(In reply to comment #5)

I see that's Symbian s60v3 too, odd you don't have this problem. What software
version do you have? ('Dial' *#0000#). Mine is 202.12.01, dating from 14-12-09.
"Changed version" is 202.12.01.236.04, dating from 06-01-10.

Mine is 220.34.37 since 20-10-2008. It also shows Nokia E51(231.03). I remember doing an upgrade once around 2010 and then Nokia updater said my region didnt have any updates and later I didnt have a windows machine to check upgrades patiently. My region is Thai or something in SE Asia.

About 12 clicks without Javascript, 23 clicks with (both in landscape mode).
The odd thing is that this only occurs when scrolling, not when moving the
cursor around the screen. Prolonged scrolling works normal.

It doesn't matter whether the screen is in landscape (qwerty-keyboard opened)
or portrait mode (holding it upright with keyboard closed). Also scrolling up
or down makes no difference.

I also think you would have S60v3FP2 / FP3, while I got FP1, so some feature set improvements might be there extra on yours.

Could you tell me if http://bit.ly/JoIoZ8 has the scrolling problem?

bugzilla_wikimedia wrote:

(In reply to comment #7)

Could you tell me if http://bit.ly/JoIoZ8 has the scrolling problem?

It doesn't have the problem, scrolling works fine there (I checked that Javascript is on). It also doesn't have the folding, all content is visible without any show/hide buttons, but I'm guessing that's intentional.

Thanks Luc
One last test should hopefully identify the problem...

#1 http://bit.ly/IaSHu6
#2 http://bit.ly/JlMeNP
#3 http://bit.ly/JoIoZ8

I'm expecting that #3 will not have the scrolling problem
#1 will
and I'm hoping that 2 won't..

You should also have toggling in this version.

Thanks for all the help!
This is helping to narrow down the problem!

bugzilla_wikimedia wrote:

Did you change the contents of #3 (JoIoZ8, like in your previous post) or did I make a mistake? Or maybe it's random, though that seems unlikely. Trying now, all three do have the problem. I didn't try without Javascript, but that likely makes the problem disappear. Please let me know if you want me to also try without Javascript.

Thanks for all the help!

You are supporting a platform with relatively very few users about whom almost nobody cares. Big thanks to you for that!

Thanks to Luc kindly joining us in IRC we were able to debug this issue and fix it
We know have much better Symbian support! :D

https://gerrit.wikimedia.org/r/5788