How to scroll better on an android phone.

scroll scroll scroll your phone gently down the screen

don't blame it on the phone, blame it on the buggy

It's a seven year old phone, that wasn't all that well-specced to start with. It can't cope with the demands of the modern internet. The most sensible fix would be to upgrade.

If you insist on sticking with it, then the first place I'd start is a factory reset (after ensuring you have everything backed up of course). In the years it's been used, it has almost certainly accrued a mountain of crap in the OS. Reset it, then try some of the more troublesome pages on a clean system - if it's still having problems, it's never going to get any better