Hi
It will be really nice if there's an option on web to hide the history read only field, But still have the page up/page down shortcuts for reading. The reason for this is on macOS using safari, After the history field is filled a little, Safari starts lagging badly with every movement, Why I know it's from the history field because when I click on clear history it becomes normal.

Hello,
you are absolutely right and I agree, even though this is just Safari and voiceOver stupidity on the Mac it would be nice to have a workaround.

Anyway, until this is resolved, I seriously recommend giving Firefox a try.
After the new accessibility upgrades released in the latest version, both on Windows but even more so on the Mac, Firefox became really fast again and actually replaced Safari as a primary browser for me.
It will of course not have this problem, hence this recommendation, and unlike Safari, it will in general not go not responding on very large and complex websites.