Hi there, so I am not a Gnome Web user, but I found out that you can sync with Mozilla and the browser looks pretty fast and lightweight, hence I tried to install and use it.
However, it seems that there is some kind of issue with how fonts are rendered in the browser.
I do not have those problems on any of the other web browsers.
It is needed to say that I tried the Arch wiki for this, and it did not work. (Font configuration - ArchWiki)
Why don’t you install ttf-ms-fonts from AUR and choose the following from Gnome Web Preferences → Appearance → Use Custom Fonts
Sans serif: Arial Regular
Serif: Times New Roman Regular
Monospace: Courier New Regular