This assumes that both your and the the subsequent site's use either pulls an evergreen version (bad practice) or the exact same version (not altogether likely)

This assumes that both your and the the subsequent site's use either pulls an evergreen version (bad practice) or the exact same version (not altogether likely). Doing enough front-end performance auditing for potential clients, it's clear the latter case is as varied as can be. We pulled everything in-house onto our own Cloudfront CDN and saved a bunch of time on DNS/TLS negotiation, as each unique third-party request is extremely expensive over middling 3G, on the order of nearly 1 second apiece according to WebPageTest. Leveraging 'preconnect' with that CDN saved just a bit more time on top of that.