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Simply the use _regress for both reg and areg, speeds things up, esp. the latter (often 3x).
I am not aware of use cases where this breaks anything. E.g the -areg- wrapper does an extra round of _regress without the FEs to report an F-test on them, but no preparation or reporting is broken otherwise.
_predict is also there for predict, though the main speedup is from -_regress, absorb()-