Raspberry Pi Performance Tricks

Diet Pi has some good information
  https://docs.google.com/spreadsheets/d/1mDHGZC-H6tU6_O8kuLTG8d4A8Nt7lV1Q7MXTR_6qw30/edit#gid=0

Throttling:
  Change soft and firm temperature limits? (soft limit will underclock, how much on CM3+? It is 1.4->1.2 on 3B+)
    In config.txt
      temp_limit=X (default 85C)
        If overclocked, sets default clocks if value is exceeded
      temp_soft_limit=X (default 60C)
        Sets temp when clock is throttled if value is met, 1.4GHz to 1.2GHz on 3B+ (what does it do on CM3+?)
  Is there a way to check to see how often the thermal throttle kicks in?
  Possibly decrease on-demand CPU governor sampling rate
  https://wiki.archlinux.org/index.php/CPU_frequency_scaling

Overclocking:
  CM3 and CM3+ have same ARM core
  CM3+ doesn't support overclocking due to Power management integrated circuit (PMIC) abilities
  The non-CM board has better heatsinking due to PCB design, even clocking to 1.4GHz would be worse

Swap Files:
  Decrease swapiness so that swaps occur less often (ideally never)
  More swap is usually worse and could possibly do damage to SD card from frequent writes
  Edit swap file size: 
    Open /etc/dphys-swapfile
    Run sudo dphys-swapfile setup
    Reboot