Try rendering your scene without textures, or creating a bunch of lower res textures.
What size of textures are you using? And how many. And what is the size of your GPU's VRAM?
Reason being, if your textures are very large, and your using a fair number of them, then, it may be filling up your VRAM beyond capacity. Therefore the computer will have to constantly swap textures from your main RAM to VRAM, which isn't exactly a quick process.
What size of textures are you using? And how many. And what is the size of your GPU's VRAM?
Reason being, if your textures are very large, and your using a fair number of them, then, it may be filling up your VRAM beyond capacity. Therefore the computer will have to constantly swap textures from your main RAM to VRAM, which isn't exactly a quick process.