Ever-growing CRL?

dnscrypt-proxy can setup connections to a wide-range of public DoH servers (it can download lists of them) and then sort them by RTT. Chances are good that over all those different Tor circuits, to different DoH servers, you'll get at least a few that are fast.

Tor is pretty fast these days. A good few years ago Tor was indeed often noticeably slower than going direct. Today I browse the web via Tor by default, and I don't ever notice a downside when it comes to speed. You can pretty much reliably watch YouTube (or whatever) over Tor these days.

The one thing you do notice with Tor is that you regularly get the "Are you a human" interstitial checks. Cloudflare seem to be clever enough to just want you to click a check-box with your mouse and not check you again for quite a while, but some others will put you through a Captcha type puzzle. Thankfully, the majority of cases are Cloudflare, so it's not really a bother. Though, Google make you do a Captcha thing. There are a small handful of sites that outright block you when they detect Tor.

At some point, I think Tor (or similar onion routing) should become the default way for end-users to interact with the Web. Privacy should be a fundamental component of the Internet.