I tested my new watch face today and there is still tremendous slow down with accelerometer function in the BETA.
Regular Facer 4.4.3_4603 App
Gif-video shows the (accelerometerRawY()) "light effect" with double speed (screen shot from my phone during turning the display in the y-axis). At the watch it looks very similar according to the reaction time.
Beta Facer App
Gif-Video from the real watch (8 times speed). It takes more than 15 second to get a new (accelerometerRawY()) value and move (jump) the shadows and the "white strip" to new position.
Facer 4.4.3_4603 vs. Beta (Jan 16, 2018)
Anyway, the speed for standard animation (based on regular time or at "interpAccel") is amazing