FPS drop/lags (Jak 2)

Hello guys !

First of, I apologize if my english isn't nice, i'm french ! :happy:

I'm trying to run Jak 2 with PCSX2 on my computer. Everything works well, exept when I look far or when I "load a part of the map".
This video will explain for me :
https://www.youtube.com/watch?v=b8aUwXFlPkU

This lags only happen when I look far. I still have 60fps but... it's laggy :dry:
After watching this, you will probably say "bad graphic card, can't handle looking far" :fuckyou:. But nope... Actually, I have a GeForce 650 Ti that runs well Crysis 3, Bf4 and other "high" games.
I really don't know what do to... I'm trying to configure by myself but I can't find the solution... :(

Can someone help me, please ? :bow: