Convergence - AlphaImageLoader affects performance

According to the YSlow FireFox extension, Convergence's extensive use of AlphaImageLoader is a detriment to performance.
Grade F on Avoid AlphaImageLoader filterThere are a total of 73 filters
* https://.../iwc_static/layout/css/main.css?...
* https://.../iwc_static/layout/themes/default/default.css?...
The IE-proprietary AlphaImageLoader filter attempts to fix a problem with semi-transparent true color PNG files in IE versions less than Version 7. However, this filter blocks rendering and freezes the browser while the image is being downloaded. Additionally, it increases memory consumption. The problem is further multiplied because it is applied per element, not per image.>
Do they really affect performance? If so, what would happen if I stripped them out of the css files?
Edited by: jessethompson on Oct 5, 2009 8:54 PM

jessethompson wrote:
According to the YSlow FireFox extension, Convergence's extensive use of AlphaImageLoader is a detriment to performance. The AlphaImageLoader filter is only applied when the client is using IE6 i.e. all of the AlphaImageLoader CSS rules have a class name of ".dj_ie6".
So removing these rules is not going to improve the speed of non-IE6 browsers and will cause IE6 images to have non-transparent backgrounds.
Regards,
Shane.

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