From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Subject: Re: [PATCH] git-branch: only traverse the requested refs
Date: Thu, 11 Oct 2007 00:00:08 +0100 (BST)
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 <1192053283-2351-1-git-send-email-hjemli@gmail.com>
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Cc: Han-Wen Nienhuys <hanwenn@gmail.com>, git@vger.kernel.org,
	Junio C Hamano <gitster@pobox.com>
To: Lars Hjemli <hjemli@gmail.com>
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Hi,

On Wed, 10 Oct 2007, Lars Hjemli wrote:

> This avoids looking at every single file below .git/refs when git-branch 
> is fetching the list of refs to display.
> 
> [...]
>
> +	if (kinds & REF_LOCAL_BRANCH) {
> +		ref_list.kinds = REF_LOCAL_BRANCH;
> +		for_each_branch_ref(append_ref, &ref_list);
> +	}

The function for_each_branch_ref() calls do_for_each_ref(), which in turn 
calls get_loose_refs(), which calls get_ref_dir() to read all loose refs, 
if they have not yet been read.

So I think that your patch (unfortunately) will no help Han-Wen's 
situation.

Ciao,
Dscho