I am rendering around 12K vertices . I have some fragment functions which are lengthy around 500 lines . these shaders are doing some light calculation and that's why accessing constant buffers. so problem is these shaders are taking too much time around 50-70 ms just to render 12K vertices. when I profiled my app then Xcode tells me that there is 4KiB memory spilling in the fragment function. fragment function is wasting 60% time in waiting memory read from buffers. I can't optimise my fragment shaders and I am surprised why Metal APIs is too slow just to render very few vertices with lengthy fragment function. what could be the problem ? is there any issue while binding my buffers to the fragment shaders ? why is metal fragment function too slow in comparison to openGL?
