Troubleshooting help needed for running cgminer on xubuntu usb memory stick

[cryptonitepc]

Can anybody please help me?

Im running cgminer xubuntu from usb 3.0 memory stick and it lags – running very slow and clunky. Also the hash rate is lower than windows 7. Any recommendations to fix this please?

Motherboard   ASRock 970 Extreme4   $98
Processor   AMD Sempron 145   $38
Memory   4GB G.SKILL DDR3 SDRAM (2 x 2GB)   $46
Power Supply   Seasonic 860w Platinum PSU   $199
GPUs   3 x MSI Radeon HD 7950 3GB GDDR5 (Twin Frozr)   $319 each
(optional)   3 x PCI-E riser cable   $5 each
(for dummy plugs)   68 ohm 1/2 watt resistors   $3

Hash Rate with 16GB USB 3.0 flash drive is 1.6mh (w7 was 1.9???)

cgminer 2.11.4

can you give any advice?