Why does my safari run slow with DSL?

I recently had to change to DSL internet, and my macbook safari does not do well with it.

I cannot seem to open more than one internet tab at a time, videos do not load, slow loading time for searching.

Is there a way to fix this to where my safari is not so slow?

Is it a macbook fix, or should I increase my DSL usage limit?

My macbook is up to date.