Ruby 2.0 Debugger 2-3x Slower than Ruby 1.9.3

We recently migrated a large Rails 3 application from Ruby 1.9.3 to Ruby 2.0 and noticed that debugging in Rubymine all of the sudden became significantly slower.  In fact, many of our developers often switch back to 1.9.3 temporarily just for debugging because it's so much faster than 2.0 debugging. For example, one page with a lot of code that take 3-5 seconds in 1.9.3 debugging are taking 10-15 seconds in 2.0 debugging.

Any one else running 2.0 debugging and seeing similar slow down issues?

* Rubymine 5.4
* Ruby 2.0.0p195
* Rails 3.2.13
* OS: OS X 10.8.4

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