Funny how DPI impacts scanning speed... I have been scanning 150 DPI the whole time hoping it would save me some time, I'm better off with 225.
(Left: DPI, Right: seconds)

The testing script for those who wonder

Do you do some kind of industrial scale scanner? Why would these small time differences matter? Please enlighten me

@kurast No it's for personal use. It's just that it's an old scanner and it is pretty slow, so I was lowering the DPI hoping to win some time, but my choice was actually not the best. It doesn't matter that much, but I found it interesting

Interesting indeed