Just like the Netflix/fast.com tests networking speed to Netflix, the cloudflare test is for networking speed to cloudflare.
Neither of those give you a general internet performance indicator. You'd need to run many tests to really know, and it depends on your ISPs network, transit and peering, most of which is pretty opaque.
Yes but the difference I had in mind is that Cloudflare is generally available (i.e. I can't host my website on OpenConnect) and they don't seem to push as far into local deployments. I've never seen a Cloudflare trace route stay entirely on my ISP's network whereas that's usually the case for Netflix.
Now, that might not be faster — my local Cloudflare endpoint appears to be ~16ms vs ~20ms for my ISP's Netflix deployment but it can tell you whether they're routinely underprovisioning peering capacity even if it doesn't give you as much data as a distributed test would.
