MS is a measurement of time and an abbreviation for Milliseconds. This image is showing the millisecond delay in communications between your computer and the server. This has a total of nothing to do with the MS that you use for your macro.
In regards to macros MS is a measure of the delay between key presses. If you are pressing manually this value will fluctuate depending on how fast you hit the key and how energetic you are. Some macros are built with the expectation that you are using external a 3rd party tool that “hits the key for you” repeatedly with a specific ms delay between key hits.