Load typekit fonts using the fetch API and abort the request if it takes to long. Example: https://equippers.de

fetch-typekit-fonts.js

if (window.fetch) {
	(async d => {
		const controller = new AbortController();
		const signal = controller.signal;
		setTimeout(() => controller.abort(), 750);
		const res = await fetch('https://use.typekit.net/xxxxxxx.css', { signal });
		const css = await res.text();
		const style = d.createElement('style');
		style.textContent = css;
		d.querySelector('head > *:last-child').after(style);
		d.documentElement.classList.add('wf-active');
	})(document).catch(() => console.warn('Font loading aborted due to slow network.'));
} else {
	console.error('Your browser sucks. No nice fonts for you.');
}