What genius added this feature?

someone who wants to reduce stress on their server

How does voting on comments cause stres

Servers need to update every new piece of data, mass changing data can overwhelm the servers

I got it after upvoting 3 comments

If you upvote in high masses, the servers will have to individually update their data across many attributes. Equaling many small changes on tight time frames

its based on the speed that you send requests over a period of time