bookmarks: prefetch 'lookup' outside of the loop...
bookmarks: prefetch 'lookup' outside of the loop
Skipping the attribute lookup up raise a significant speedup.
Example on a repository with about 4000 bookmarks.
Before:
! wall 0.026027 comb 0.020000 user 0.020000 sys 0.000000 (best of 112)
After:
! wall 0.021580 comb 0.020000 user 0.020000 sys 0.000000 (best of 134)
(This is also in its own changeset to clarify the perf win from another coming
changesets)
