BF 360 Lag : Due to a weapon from Back to Karkand

Alright, so whenever I play with the G53 (http://battlelog-cdn.battlefield.com/public/profile/bf3/assignments/512/l/a03.png?v=3173239), tried it 3 times on Gulf of Oman, I get like 5 FPS on my 360.

Anyone else had this problem?