Google fonts causing page slowness

I am attempting to run the Duplicacy web interface and it was working fine but now each page is taking seconds to load. I can see in dev tools that the call to is taking several seconds to return. Now this won’t be an issue to do with duplicacy but having it as a blocking call is a problem, ideally it wouldn’t stop the page from loading.

What browser is this? I wonder why the fonts aren’t cached by the browser.

Firefox. It’s become intermittent and I’m sure I probably have another issue but ideally it wouldn’t block page load given it’s cosmetic