Preload — track what applications are used and preload files
https://www.cyberciti.biz/tips/speed-up-your-linux-system.html
Misc suggestions
http://www.hecticgeek.com/2012/06/few-things-to-speed-up-ubuntu/
Look at the above for ‘BFQ’, article also mentions ‘preload’
http://www.hecticgeek.com/2012/10/defragment-ext4-file-systems-using-e4defrag-ubuntu/
defrag ext4 file systems — $ e4defrag -c /location