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Initial Answer:

The problem is that your local_costmap has a higher resolution than usual. The PR2 has a 6x6m local map with 2.5 cm resolution. Your turtle has 5x5m with 1cm resolution, which ends up being 4x bigger in memory.

When the turtle moves, the costmap has to recenter, which ends up taking a long while. My test shows that setting the resolution to 2.5 results in the correct behavior.

There's still the question of why this problem didn't come up in Groovy. That's a question for another day.