Remove matplotlib import
Blinking code in C using bcm2835 library
Script to shutdown system services in RPi
Rename
Delete the renamed one
Implement LED stimulation in separate processes

Waiting for timer expiration in a tight loop doesn't work at all
in Raspberry Pi. Instead create separate processes for each LED and
use sleep based tight loops in them for not hogging the CPU.

This reduces full CPU utilization to something like ~10-15%.