1)TEMPORARY IT WORKS UNTIL REBOOT
1. run Root Explorer
2. go to /sys/devices/virtual/bdi/179:0
3. open file read_ahead_kb in editor
4. change 128(or different) to 2048
I found topic with script to install via Recovery and it's PERNAMENT.
You can check your writing&reading speed before and after this mode in program SD Tools from market.