Although more download bandwidth is required, upload too is required.
With much of the worlds ISPs offering much higher bandwidth, web site authors are making webpages more and more graphic intense, requiring more bandwidth to open.
I find it necessary to reduce my upload by 20kB/s to do surfing.
Some sites/browsers offer options to not load graphics, perhaps you can look into browser plugins for limited bandwidth. I have no experience in this area, so can’t advise on any.
“the bottom line” is that there is no replacement for more bandwidth.