I have a problem i play  minecraft ftb unleashed pack.

and i made a base. but in my base there is one chunk that lags. in that chunk there is nothing no machine, no cable, nothing. if i walk over the chunk i go from 40fs to 6fs and it only in one direction .

 

do you know how to fix it or what is causing the problem?

There is probably either a lot of entities int he one direction you're looking.

Or something over there that is rendering badly. Nothing really we can do to help without you doing a bit more debugging.

ok i made a video .

 

normaly i have 20 frame and when i go to area's my fps do down. i check you link but i don't know what number are changens and what causing this

 

 

http://youtu.be/lDJauBXtQz8

that looks like whatever is beyond that wall is rendeirng entities, poorly. Because as you walk close to the wall your entity count raises by ~20.

What is beyond that wall?

pig spawner. but on the other side were the furnaces are i have fps issues also and behind that wall is nothing