Ok, I'm writing again with reference to this thread.
As of this moment VP's export speed without auto-fix or h265 is reasonable, but not the fastest. The program I moved from to VP, Pinnacle Studio 15, rendered faster in some conditions like without lighting effects. It just could not retain the original clip's quality no matter the bit rate I set to it. That's the first reason I tried VP out and fell in love with it immediately. PS15 also was way less stable and often unable to export when effects are stacked up. So that's another reason I like VP about, stability and reliability.
However, when PS15 renders with text effects, the GPU will get to work too so maybe it's one of the reasons why it's faster, with the other reason being rendering with more quality loss obviously.
This is my piggy bank. http://www.rsw.com.hk/piggy-bank.jpg