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Two possible culprits:

My first guess is that the 1s is actually almost certainly from constructing a new MoveGroupInterface - which has to read all sorts of YAML files on the filesystem. Try moving the first call to ros::Time::now() after that to only measure the getCurrentPose() time.
A second possibility is that your TF is not up to date, if you're on multiple computers make sure the clocks are synced.

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