internet explorer 9 - Javascript: why is our website extremely slow in a Terminal Services session? -

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we created website relies heavily on javascript , has quite lot of dom-elements.

in browsers, ie7 , ie8, works fine. user experience bit faster , more responsive in ie9, chrome , firefox, our clients use ie7 don't complain.

but... clients use remote desktop complain our website much slow, when using ie9 on windows 2008 server (64-bit). pages take 1 second load, take 30 seconds! reason not slow internet connection, other websites load quickly, our website doesn't. , when these clients use chrome it's fast, problem somehow in combination of remote desktop , ie.

now here comes strange part : when button "compatibility mode" clicked in ie9, our website fast again!

what cause these extreme differences in speed?

we thought using <!doctype html> in ie9 best practice, seems in remote desktop session somehow should use quirks-mode or force compatibility mode??

any thoughts on subject?

update

we found solution : disabling css rounded corners ie9 !
(see accepted answer)

we found out reason behind delays !

we use jquery ui theme has many rounded corners (using css).

the rounded corners bring ie9 grinding halt in terminal services session!! (ie10 doesn't seem have same problem).

unfortunately there's no way detect if using terminal services, because microsoft stupid enough use same browser version number windows 7 , windows 2008 server (!), decided disable rounded corners on our website users ie9.


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