Even 1 Gbps is plenty to handle 1,000 connections unless you're serving up video.
That's 1 Mbps per user. If your web page can't render (ignoring image loading) within a couple seconds even on a connection that slow, you're doing something wrong. Maybe stop using 20 different trackers and shoving several megabytes of JavaScript to the user.
The thread is about self-hosted CDN capabilities. Serving large images and video is what CDNs are for. I’m just talking technical limitations here, chill a little bit with the “your web page”.