IE 8 image slow zoom and drag problem

Question

Hi

I am using jquery mapbox plugin to zoom in /out image and drag image.

2 images are used: initial image and zoomed image

Initial image size is : 947*664 pixels

My zoomed image size is 8000*5605 pixels

Dragging image in div of size 947*664 pixels is very slow.

However it works fine in IE9, chrome and firefox

Please guide that what must be done so that dragging is smooth in IE8 also

Answer 1

Hi,

Which version of jQuery are you using... see bugs.jQuery.com

Do not use browser sniffing ($.browser .... depreciated)...

for more help please provide a link to your website or mashup.

Regards.

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Rob^_^

Answer 2

Hi Rob

I am using 1.6.4 version of jquery.

I have not used browser specific code.

I did came across similar kind of problem faced by someone..

http://stackoverflow.com/questions/4635158/ie-8-speed-performance-issues-when-rendering-large-image

However no fix has been identified.

It seems to be IE8 problem but I dont have any valid source confirming the same.

Thanks

Richi Arora

Answer 3

these are public forums.

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Rob^_^

Answer 4

ok Rob.

So what is your take as this is fine in IE9 and I have seen pages that say javascript engine in IE9 is upgraded and better support for graphics could this be the reason

Answer 5

Hi,

I'm not familiar with the jQuery mapbox plugin, but it sounds like it is using VML for IE8 and lower and SVG for IE9 and higher....are you using the latest version? It may have been written before IE9 was around.

You can do all of your testing in IE9/Windows 7 to rule out directx differences.... use the Developer tool to toggle both the Document Mode and Browser Mode to IE8.

I would use the google cdn to ensure you are always using the latest version of jQuery.

I am unwilling to make any other guesses.... we do not work for or represent MS... consider... it is all but impossible to give a value answer without access to a web page or mashup... we do not have the time to guess HOW you have coded or to research all of the possibilities, particuarly with third-party plugins, they have their own support forums.

Possibly it also may be a hardware issue on your XP/IE8 (computer or VI?).... do a dxdiag and ensure your drivers are up-to-date. Regards.

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Rob^_^

Answer 6

Hi

I used compatibility of IE8 in IE9 while testing same using developer tools.

It worked fine in IE8 mode.

But when I actually tried on IE8 the dragging of such image is slow.

Also, I have came across following: 

http://www.dimin.net/software/panojs/

This is javascript that changes image into tiles.

When i tried same on IE8 it is slow compared to IE9/firefox.

you may visit this URL and see.

This javascript supports : IE8+

Answer 7

Hi,

You will have to take it up with the shim author....

@author Michal Migurski <[e-mail]>

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Rob^_^