Since re-installing Substance Painter, it is extremely slow and I can't even paint in Solo mode without it lagging very badly. My fraps displays 2-5 FPS in the viewport window.
It worked fine on my old setup of Windows 7, i7-3770k and a GTX970. Now I'm running an i7-4790k and two GTX970's in SLI. How can it be worse? I don't expect to get a performance increase with SLI in Substance as it's unlikely to support it, that's why upon turning it off, it made zero difference and I had the same lag.
Are the nvidia 355 drivers to blame and affecting Windows 7 also? I refuse to upgrade to the terrible Windows 8/10.