With Rails 3 in development mode, one of my pages loads in 2 seconds. On 2.3, it loads in about 0.6 seconds. :( Rails 3 is awesome, except for the performance

With Rails 3 in development mode, one of my pages loads in 2 seconds. On 2.3, it loads in about 0.6 seconds. :( Rails 3 is awesome, except for the performance issues. I'm not sure how to go about looking into it. When I profile, the bulk of the time is spent garbage collecting apparently.