[htmltmpl] Multiple templates within a template

[cfaust-dougot <cf...@do...>]

I couldn't really find the answer I was looking for by search the =
archives, so I thought I would simply ask..
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I'm getting into the habit of making a single TMPL file (or new single =
HT object) in which I will have anywhere from 3 to 5 different pages in =
it, each within its own template if.
Quite often there is redundancy within the template if's and I'm =
ultimately only displaying one of the template ifs...=20
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From a performance standpoint, how bad is this?=20
Is it costly enough that I really shouldn't be doing it?=20
If it is a problem, is it because it increases the overall size of the =
tmpl file? Or is it because I might be setting multiple =
tmpl_var's,tmpl_loop's etc 2 or 3 times within the template when I only =
needed to do it once?
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Everything is under mod_perl and I cache the templates, if that makes =
any difference.
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I know I could probably use benchmark to do some tests, but I figured =
I'd try the list first.
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TIA
-Chris