netr28ux.sys Usage High Cpu on Download and Use Internet

netr28ux.sys from driver USB(RT2870/RT2770/RT307X/RT2070
RT357X/RT3370/RT8070/RT5X7X) Mediatek >>> older ralink

I'm use usb wifi Signalking 999WN on Windows 8
umm.. now use internet [many bandwidth] and download file [IDM Chrome FF IE10] is system processor use high cpu 10 - 30 %

I use lasted driver from Mediatek but have promblem

Help Me plz Thanks

Picture promblem





My Spec

E8400 3.00Ghz
Mobo EP45-UD3R
RAM 4 GB
HDD SATA II AAKS 640GB
SSD Plextor M5S 64GB
NVIDIA GTX 465 1GB