Most efficient evaluation

I'm looking for the most efficient/performant way to evaluate a
template and have some questions surrounding this.

1. Are Template objects reusable and thread safe?  If they're just
ASTs, it seems like they should be.

2. Does the Velocity/VelocityEngine class cache compiled templates (as
Template objects or anything else)?

3. If yes to both above, is there really any difference between
calling Velocity[Engine].merge and Template.merge?

Thanks.

--
Chad La Joie
www.itumi.biz
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