Speeding up pg_upgrade

I have just applied a patch to minorly improve performance of pg_upgrade.

Below is a pg_upgrade test run from 9.0 to 9.1 with the 'regression'
database loaded;  the numbers at the start of the line indicate the
number of seconds from the previous line being output.

Does anyone see any way to speed up pg_upgrade?  I don't see it:

---------------------------------------------------------------------------

0|Checking old data directory (/u/pgsql.old/data)             ok
0|Checking old bin directory (/u/pgsql.old/bin)               ok
0|Checking new data directory (/u/pgsql/data)                 ok
0|Checking new bin directory (/u/pgsql/bin)                   ok
start old
6|Checking for reg* system oid user data types                ok
0|Checking for /contrib/isn with bigint-passing mismatch      ok
11|Creating catalog dump                                       ok
stop old
start new
7|Checking for presence of required libraries                 ok
0|
0|| If pg_upgrade fails after this point, you must
0|| re-initdb the new cluster before continuing.
0|| You will also need to remove the ".old" suffix
0|| from /u/pgsql.old/data/global/pg_control.old.
0|
0|Performing Upgrade
0|------------------
0|Adding ".old" suffix to old global/pg_control               ok
4|Analyzing all rows in the new cluster                       ok
1|Freezing all rows on the new cluster                        ok
stop new
2|Deleting new commit clogs                                   ok
0|Copying old commit clogs to new server                      ok
2|Setting next transaction id for new cluster                 ok
1|Resetting WAL archives                                      ok
start new
4|Setting frozenxid counters in new cluster                   ok
5|Creating databases in the new cluster                       ok
0|Adding support functions to new cluster                     ok
9|Restoring database schema to new cluster                    ok
1|Removing support functions from new cluster                 ok
stop new
2|Restoring user relation files
1|Setting next oid for new cluster                            ok
0|Creating script to delete old cluster                       ok
0|
0|Upgrade complete
0|----------------
0|| Optimizer statistics are not transferred by pg_upgrade
0|| so consider running:
0||     vacuumdb --all --analyze-only
0|| on the newly-upgraded cluster.
0|
0|| Running this script will delete the old cluster's data files:
0||     /usr/var/local/pgdev/pgfoundry/pg_migrator/pg_migrator/delete_old_cluster.sh


--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + It's impossible for everything to be true. +