I took a 20-page multi-threaded ruby code that took 2-4 days to complete and changed it to a 1-page MySQL stored procedure with some @variables. Brought it down

I took a 20-page multi-threaded ruby code that took 2-4 days to complete and changed it to a 1-page MySQL stored procedure with some @variables. Brought it down to 4 minutes to run. And to top it off, reduce the overall server load from 96% to 20%. I kept that CPU usage chart and added it to my CV as it was quite impressive to look at.