Apparently the Moto X4 is fast with Lineage OS on it

Motorola/Lenovo can’t do software right, the community does a better job.

Problem is, one button navigation doesn’t work, so you have to use the on screen buttons, no using just the fingerprint sensor.

Also, don’t know how to flash both partitions, never had a phone with A & B. If you forget to flash the other partition, you might brick it.