PPSSPP options explained

[solarmystic]

I've a question about this option and it's explanation:-

Quote:Hardware Transform: uses vertex shaders to do T&L on the GPU instead of doing it in software on the CPU. It should be identically visually to SW transform but it isn't, there are some small differences between the implementations. It's faster depending of the GPU.

Why does disabling this function result in a speed up for certain games which are CPU heavy when logically speaking the opposite should occur?

For example, in a CPU heavy game like Tekken 6 (completely saturates one CPU core and does not attain 60 VPS), one should expect that disabling HT would result in a performance loss, but I instead gain a significant amout of performance when HT is disabled. The GPU is not the limiter as increasing/reducing rendering res or 2xSSAA doesn't affect the VPS which means that it is CPU capped.