Thanks !

I've tried to access the nodes by indexes (not through enumeration) - doesn't help much. Ran the profiler on mshtml.dll too, and it showed that most time is spent on accessing the attributes and children of nodes. Thus there's only one possible reason - either .NET works slowly when accessing mshtml elements, either the mshtml is generated wrong (which I doubt).

Actually I use standart controls in a usercontrol. And this usercontrol is placed on a form. Anyway - I read somewhere that SuspendLayout works only a few of the controls, because many of them has their own way of painting. With standart controls, probably like buttons, labels - it may work. With textboxes it doesn't work for sure (as it's controled by Windows).