That solution is really really slow compared to other things I have seen. [Lightfrog, Shadows by Slin or Shade-C]
If it's slow try to use lights with lower resolution, the performance gain will be huge.
Shade-c doesn't support point lights atm and LightFrog doesn't work on A8. I tried to get ShadowCollectionV3 by Slin working but there is something wrong with them, I can't see a port of the screen:
If someone knows how to fix that please let me know