I've used plenty of HTML pages and web views in DPS folio's with varying amounts of success.
As always with these questions, I will have to ask a few myself!
iPad1 suffers much more than iPad2 with HTML animation, I use Hype a lot, what HTML editor are you using. I oftern read issues with Edge, and Flash converted to HTML should be avoided in most cases if possible IMHO
So I'm afraid you have to use HTML carefully and sparingly