Poor move_base performance on Nvidia Xavier

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I recently migrated a robotics project from the TX2 to the Xavier, and my navigation has been functioning poorly. The map update loop frequently misses its update loop of 10 Hz, whereas the exact same software with the same settings very rarely had this problem on the TX2.

What I've tried:

• All of my sensors are publishing at rates over 10 Hz
• Two separate Xavier devices flashed with the newest firmware.
• Both TrajectoryPlannerROS and DWAPlannerROS
• Maximum performance mode on the Xavier
• CPU usage is low. move_base isn't even using all of a single core. The Xavier is significantly faster than the TX2. I'm fairly confident this isn't a CPU performance issue.

The only difference is that the Xavier is running Melodic and the TX2 was running Kinetic. My software is unchanged. I looked through the default values for move_base in Melodic and Kinetic and they appear to be identical. Is there anything else I should try?