that speed is abyssmal .... no wonder its slow to populate pages !
Can you do the same on the old PC ?
6.8 Meg may be abysmal but is twice what we get out here in the sticks

You really shouldn't notice much delay in loading pages at that speed unless there are lots of large photos or video.
I find 3Mb quite adequate for normal use although it can be a bit frustrating watching the iPlayer, etc. Windows 10 can be greedy for resources but I turn off as many as possible of the 'features' that run in the background and slow things down. Also Windows 10 updates seem to completely take over the system for the duration, so you just have to admit defeat and find something else to do for a while.
Mike.