I have an update panel with about 5 slider extenders, 10 textboxes, and 3 dropdown bullet list. When a slider is moved, a partial postback occurs, that which the server also updates another textbox with a value by first setting the textbox (.text = somevalue) and then calling the updatepanel.update().
I find out that this command updatepanel.update() significantly causes IE6 and IE7 browser to lag about 1-1.5 seconds longer when updating the values in the textbox. It is sort of unacceptable.
I have applied this fix already: http://support.microsoft.com/kb/2000262
but it is not helping.
However, I must say, this problem is not occuring in FireFox 3.6. In fact, it has no lag whether or not the fix is used. The problem only occurs in IE6 and IE7.
Any idea why an updatepanel is slow to refresh?
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