By the way: I tried this out with the IPFS node in my Brave browser, peering it against Cloudflare as provided in the example.
Uploaded a PDF, got its share link (https://ipfs.io/ipfs/XXX) and then accessed it via https://cloudflare-ipfs.com/ipfs/XXX. The PDF was new, freshly uploaded, but my other browser (Google Chrome) pulled its data in a second or two. It wasn’t noticeably slower than normal web pages.
Promising.