Hello.
Trying to identify why the toolbar was so slow to load, we switched the image button sources to [imagename].gif, instead the original [imagename].gif.aspx (we had to extend the Editor Class and overload the Render method).

It resulted in a faster loading (and a still functional editor) in a charged server.

So, why the image buttons have to be linked as aspx images?

PS: we used the 5.2 version.