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From: Linus Torvalds <torvalds@osdl.org>
Subject: Re: [WISH] Store also tag dereferences in packed-refs
Date: Sun, 19 Nov 2006 12:44:11 -0800 (PST)
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On Sun, 19 Nov 2006, Linus Torvalds wrote:
> 
> So the optimizations that _can_ be done are:

Of course, doing a "git repack -a -d && git prune" is always the #1 
optimization. It will still look up the objects, but it will be a lot 
faster about it, and avoid a lot of the really bad IO patterns.

If you don't want to repack, you could try just doing a "git clone" and 
then doing the "git pack-refs --prune" in the clone too. And compare 
cold-cache times between the two "identical" repositories.