Comment 2 for bug 374726

First results: the performance is worse.

It can be acceptably worse (~15%) or dramatically worse (x20).

A aggravating factor is the number of pack files. Issuing a bzr pack bring that done to x3.

Looking closer with --lsprof reveals an explosion around the # calls for
BTreeGraphIndex._get_nodes() from ~3500 to 300.000 in the 3x case.

I've yet to understand if it comes from chk nodes access (doubtly) or is groupcompress related (likely). If the later, we may need to tweak some cache for annotate.

Any feedback welcome in the mean time :)