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Is it better to describe improvements using percentages or just the differences in the numbers? For example if you improved the performance of a critical ETL SQL Query from 4000 msecs to 312 msecs how would you present it as an ‘Accomplishment’ on a performance review?
It is always better to measure relative improvement.
So, if you brought it down to 312ms from 4000ms then it is an improvement of 3688ms, which is 92.2% of the original speed. So, you reduced the runtime by 92.2%. In other words, you brought the runtime down to only 7.8% of what it was originally.
Absolute numbers, on the other hand, usually are not that good since they are not comparable. (If your original runtime was 4,000,000ms then an improvement of 3688ms isn’t that great.)