Client Lagg?

[jahngod]

I have a 1mbit connection, and no programs open on my PC.

When i m playing Graal, its fast and fine for about 5 / 10 minutes, then the lagg hits and i have to re-open the game.
When i reopen the lagg is gone. SO it isnt the ammount of people near me - because they are still there.

My ping can be as little as 20 when this happens.
I have plent of system resources, my CPU is no where near 100% and theres spare RAM.

So what is causing this?

Btw Client 3 seems to work fine, and i would use it but its inpracticle.
Textures missing, look weird, and chests unopen etc. Its too BETA to use permanetly.