Why is Pt Sans so much heavier than other fonts in google fonts?

Question

Fonts

Hello Toaster!
The question is this: when you select different font styles and languages ​​​​in Google Fonts, it shows the approximate download time. So, for some reason, with the same number of languages ​​and styles, PT sans is three (!) More than once heavier than the same Open Sans. I just can't understand, maybe I'm doing something wrong? But if everything is fine, isn't there the same number of characters? why such a huge difference?

Answer 1

In addition to the characters themselves, the font contains a lot of service information, for example, hinting and kerning tables, as well as the total set of characters (which you do not use, but which are still present there) can be higher. Those. A lot depends on how well the font is made.