How to optimize further? Should base 64 be used for images?

Question

css

Hello! The question is how to optimize further?
There are 5-7 sprites on the site, probably 4 are loaded on 1 page for sure.
I started to break through the topic with base64, but something is not entirely clear. Image files grow by 30%. But we are starting to save on connections, which are perhaps critical if you are on a mobile phone.
Tell us in more detail, it is very interesting in which case it is necessary to encode exactly, in which not so much. And how are things going with the connection queue in browsers now? I know that it used to be around 5-7 at a time, depending on the browser.

Answer 1

Image files grow by 30%.

gzip should compensate.