The main reason for this settings is that you can scroll in a page before it is full load.the full load time is normaly not much faster.
Just to make sure, I tested it again.
Test on my classic system with 060/50, PIV, screen depth 1024x768 16-bits , Netsurf windows size 1024x768:
With old options: amiga org displays the page after 20 sec., but full page load takes 60 secs. I've tried this 2 times with a freshly started system. Both times it takes about 60 sec.
With new options: amiga.org displays the page after 20 sec, but full page load takes 39 secs. Also tried 2 times with a freshly started system. Both times it takes about 39 sec.
Test under WinUAE screen depth 1600x1200 32-bits, netsurf window size 1024x768:
With old options: amiga.org displays the page after 8 sec, but full page load takes 24 secs. Also tried 2 times with a freshly started system. Both times it takes about 24 sec.
With new options: amiga.org displays the page after 5 sec, but full page load takes 15 sec. Also tried 2 times with a freshly started system. Both times it takes about 15 sec.
With amigaworld.net I hardly notice a difference. I haven't measured the time with any other sites.