Precompiled headers and templates

[Yang Zhang]

Have people found precompiled headers to make significant difference 
with template-heavy headers, esp. things like Boostified projects?  I've 
been trying to look up details on what the pre-compilation entails, but 
I still don't have a good handle on this.  I'm mainly wondering whether 
it speeds up anything for templates that are instantiated outside of the 
header (i.e. at the use site).  I'm guessing not, since template 
instantiation can induce arbitrary computation.  If I'm right, then do 
most folks try to include explicit instantiations in their precompiled 
headers?

I plan to experiment with this, but am curious to know what others have 
witnessed.
-- 
Yang Zhang
http://www.mit.edu/~y_z/