By disabling unnecessary Module on your OS and calibrate the os and tune os for your Hardware , speed up your system to 2 or 3 second and less than 1% CPU Usage.
by using this solution , after runing , your system speed up to boot and your kernel size reduced .
#user Manual:
in the first step go to the directory downloaded and set Excute attribute :
chmod +x bootspeed.py
chmod +x src
and then Excute :
./bootspeed.py
and whait to Complate .