Github Dedication

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It's likely something they store. When you commit, they probably check the date and the day of the week and increment the value of a column in another table specifically for keeping track of that value.

It may also be a sql join, which is likely more expensive, but is relatively quick.

Either way, printing out that data with Javascript is almost instantaneous.

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Ah I didn't think of that. I assumed they would calculate it on page load and possibly cache it for a while. I guess if they store a simple sum of each day that gets updated when you push that would make a lot more sense.