I have one Jaebrin that is in hells another in LL and the test char I made yesterday am. None are "fast". In the past, Anarch, Shard, etc have been fast once the message "subrace edits applied" appears in sys msg on the docks.
Edit - update
I just checked my anarch shifter, which was created in the last week, it is "fast" when tested vs. a lvl 1 human - neither hasted - anarch gradually overtakes human. In the case of Jaebrin vs human, the characters remain at the same relative distance as they move. Apparently the "fast not working" issue doesn't extend to anarch.
If you want, and the subrace has alternate appearances, you can try changing them with the pc scrye - there is a change that will trigger the speed change. No guarantees, but worth trying before reinc.