We were looking to see if we could speed up our tracker
a bit, and discovered that roundup.backends.__init__
does some exhaustive searching for working backends,
making a few thousand pointless calls to open(), etc.,
on every page view.  As far as I can tell, the only
thing in the entire system to depend on this code is
the installation code; perhaps it could be moved to a
function like list_available_backends() or something,
and that code could call the function instead?

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This is the case when you're running the interface using the 
cgi-bin script. Even removing the checking in the backends 
code, there's still a hella lot of importing going on. 
 
I recommend that you use the roundup-server script if 
performance is an issue. 
 
This code will behave differently in 0.8 in any case.