found the issue. i called the draw function every frame that caused the frame drops.
how can i get around this? because i need to update the instanced static mesh component from time to time. so the RVT draw function is recalled every time i do that 
found the issue. i called the draw function every frame that caused the frame drops.
how can i get around this? because i need to update the instanced static mesh component from time to time. so the RVT draw function is recalled every time i do that