What people do not realize is before a lot of web pages load, the sending server loads all sorts of snooping routines to read your emails , go through your browser history and cashed pages . on Windoze boxes they also go through you calender, Entourage & address book so they can show an add for a resteurant near the meeting you & Scrubby & Star are having next week & even show food images of meals you have paid for using your credit card with a bonus points scheme.
Then it works out what adds to show you and sends messages to the servers that have those adds on and implants the links into the page you are waiting to see.
Some versions of Brave actually show you how much time it has saved you either as a sum or for each page.
While it is only a a few seconds per page, looking at todays posts that adds up to several seconds.
The killer is the band width ( data ) you are not being charged for.
I used to deliberately click on some adds every now & then because it is the adds that pay for the running costs of the forum, but the advertisers ( google ) have just become too greedy .
So I installed some add blockers and my monthly usage dropped from 19-25 Gb / month down to 15 Gb
With Brave it has never been over 10 Gb so now I can buy a 15 Gb wifi plan for less than the unlimited landline ( ADSL ) and never go over limit.
Downside is there is no Brave for my Iphone 4 because I could go onto one of the $ 5 / MONTH plan that only has 1 or 2 Gb of data .
Then there are the web #ankers who load every page with as many routines that do almost nothing of any benefit for the viewer to prove how cleaver they are .
The pages I run ( badly ) are all written in HTML-2 and will finish downloading before your finger leaves the Enter key .
Or as one of my friends who works in command line level
Why write 300 lines of commands that do the same job as 3 .
Because of his programming skills ( & philosophy ) one government department managed to run their computers for 13 years which saved $ 11,000,000 in replacement costs.
When the new machines were installed, the staff went on strike because they were slower than the ones they replaced and a lot more complicated to use ( they went from Macs on Linux to Dells on Windoze ) .