Can you screenshot your graphic settings in lineage 2?
To be honest, I played the game on a worse setup than yours and i've never reached a 1-7 fps in town. Mass pvps being a different story of course.
Also, this might be a silly question, but humour me. Is your windows and the game located on the ssd or on another disk?
I can't because i have not the game installed at moment. But i go install in soon, maybe today.
The graphics settings i use in lineage2 it's the "normal" with textures and details in high, gamma average but i don't use any effects like glow and others. No shadows, only cloaks, and texture filters.
If i put the graphics to low in everything (ALT + P) or set all low configs, the fps it is almost the same.
I think 90% of Lineage2 performance comes from processor, The 3610-QM it's a 2.1ghz only and up to 2.7 with turbo cache (i don't know if need some software for that, i need to check and make some tests because i change the HD 1TB for a SSD and i don't install the softwares of monitoring turbo cache), in some windows this software crashes everytime, then, i don't install it again.
Actually i use windows 8.1, but i try in windows 10 too, with last version of drivers but FPS sux and huge lags in both...