God Of War III - OpenGL faster than Vulkan, driver problem?

hi, im using GTX 1660 Super and the latest nvidia driver, using the latest RPCS3 also, with latest patches. usually all my games play normal using Vulkan and it lot faster than OpenGL. but some of games work faster on OpenGL (by +- 30%) such as God Of War 3, but the compiling shader is extremely slow, like 4 seconds, only +1 shader, while using Vulkan, its extremely fast, only the FPS that slow. 

is that normal compile that slow using OpenGL?
or do i need to set something on my nvidia control panel, which is now default ?

and 1 more thing, it seems, i cant play if i untick the "Accurate xFloat", the menu will turn flat, and the rain will turn yellow. is it got somthing to do with nvidia control panel?

thanks