Trick for speeding up page repainting

saw this trick. Is it safe and when should you use it?

[Clark]

I just read about this trick:

<META http-equiv="Page-Enter" content="blendTrans(Duration=0.2)">
<META http-equiv="Page-Exit" content="blendTrans(Duration=0.2)">

It's supposed to speed up page transitions or something. Didn't quite understand it as the site did not go into depth about it. Anyone here know about it, what it does and why? Seems to be related to Ajax although supposed to be usable on non ajax sites.

[MarkFilipak]

Looks IE specific to me. MS put all sorts of crap like this in IE.

[Clark]

Supposedly good for firefox too and there are some other techniques for safari. Still not sure what exactly it's doing though.