Migrated app to rails 3, now very slow bootup times

We tried to migrate our app to rails 3/ruby 1.9.2 and now have huge
problems with the initialization time of the rails instances.

After a touch tmp/restart our passenger 2.2.4 needs several
minutes(!!) to boot up 20 instances and to serve the first requests.

We didn't had that problem in rails 2. I would love to find out what
is taking so long, but I don't have any clue on where to look for it.
How do I debug this? Did anybody had the same experience?

We tried to migrate our app to rails 3/ruby 1.9.2 and now have huge
problems with the initialization time of the rails instances.

After a touch tmp/restart our passenger 2.2.4 needs several
minutes(!!) to boot up 20 instances and to serve the first requests.

I would suggest trying the new passenger standalone, and see if that
improves your speeds. Then if that helps definitely try out the full
passenger 3 beta with your application.

We didn't had that problem in rails 2. I would love to find out what
is taking so long, but I don't have any clue on where to look for it.
How do I debug this? Did anybody had the same experience?

You could also try profiling your application to see where you can
improve.

Yes, the passenger 3 beta is far better. We now have the same bootup
time as with rails 2.

Thanks!