Hello.
Sorry for my english . Thanks to Google Translate.
I installed the kernel 3.9.4 and the speed increased to my maximum.
If you want to this ,open a terminal and navigate to temporary directory
Download the necessary packages:cd /tmp
32bit:
64bit:wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.4-saucy/linux-headers-3.9.4-030904_3.9.4-030904.201305241545_all.deb http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.4-saucy/linux-headers-3.9.4-030904-generic_3.9.4-030904.201305241545_i386.deb http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.4-saucy/linux-image-3.9.4-030904-generic_3.9.4-030904.201305241545_i386.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.4-saucy/linux-headers-3.9.4-030904_3.9.4-030904.201305241545_all.deb http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.4-saucy/linux-headers-3.9.4-030904-generic_3.9.4-030904.201305241545_amd64.deb http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.4-saucy/linux-image-3.9.4-030904-generic_3.9.4-030904.201305241545_amd64.deb
Update GRUBsudo dpkg -i *.deb
Restart your computer.sudo update-grub2
Remember that you do so at your own risk.
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