Directional Light Causing Low FPS

In my game I’m using a directional light with 0.6 intensity and with shadows. But I have a FPS problem(getting 6-15 FPS). But when I’m delete the light I’m getting good fps(40-60). How can I solve this problem?

I’m using Asus AMD Radeon R7 240 with AMD A8-5600k apu. 4 GB Ram

hi there
i have the same problem too
I just changed the mode of directional light from Real time to baked
and i got FPS of 80-90
hope it works for u