I think it's a fair question, and would be very interested in seeing a response. I've not tried Titan HM yet, so I can't say I've had the complete 'lag' experience. I can say that - for someone who has a AAA network and a dedicated 150MB FC network connection - I've had to reduce my game settings and framerate after getting extreme lag on Ifrit HM and dying to plumes. The fact that I benchmarked so high, but have to handicap myself and my game experience annoys me greatly - I even recently forked out for an i5 Haswell chip and new MB to combat this very issue, but found the results to be frustratingly similar to playing on my 4 year old MB and Chipset.

I'm secretly hoping the DX11 version of the game will address this, but I accept that's probably a pipe dream.