Prerender comp takes forever

I am trying to do speed up AE, to the extent it is possible at all. So I have read me up on several articles covering this topic, among others this.
My first attempt to speed AE up, is to prerender a composition. It takes forever! The entire project, with several comps, time warp, keylight, masks, 3D layers etc. takes 7 minutes to render - complete. When I try to prerender on of the compositions, the gauge moves at snail speed, and estimated time for the prerender is 1 Hour and 37 minutes..
Edited:
Ok, I found the culprit: The Timewarp.
The comp I try to prerender uses an underlaying comp. This underlaying comp has just one AVI, and this AVI has just one effect added - the Timewarp. When shutting Timewarp off - all runs fast.
The big $10 000 question now is why the Timewarp slows down prerendering one particular comp - but does not slow down rendering the main project where the comp containing the Timewarp is included!
Edited - 2:
I now tried to prerender the comp with TimeWarp only. It is an AVI 960 x 540 pixels, 25 fps. And it has one single affect added - TimeWarp. This needs 24 minutes to render..
And the whole shebang - all comps, effects, layers (more than 20) takes 7 minutes to render.. Can the layer (comp) in question somehow have been rendered anc cached in the background, while I have been working? I have disk cache turned on. And that AE now is ignoring this cache?
I need a detective, Poirot or someone with his capacity!
Ingvar

I can say so much that the Timewarp effect performs beautifully in the final render, It is one of the first times I have used it, and I am very impressed. I adjust the speed several places, to match one action with another action. At a certain point, Timewarp only has a few frames to stretch over a longer time span, and it does this just beautifully, real convincing slowmo. So it definitely kicks in when doing the final render.
Anyhows - I do not give it too much thought.
What I did, I rendered the original clip and accepted  24 minutes to get it done. I then used it in the main comp, and can now preview at full speed.But one and a half hour in a nested comp - as opposed to seven minutes in the final render.. I suspect you are right, AE is working too hard and thinking too much I believe..
Ingvar

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