4-box low FPS with patch 1.08

Hello guys i just decide to begin multibox again and what i found got seious fps problem with patch 1.08 .... i didnt change anything in my configuration last time i was multiboxing was at patch 1.07 and i didnt had any problems

PC spec
CPU i5 3470
Ram 8 gb
GPU HD Radeon 7850 HD 2 gb