We tested this again today on the latest beta build (iOS 17.0 Beta 4), same result.

Thanks for getting back to me. Reading that bug it seems that your issue is that things run very slowly. In that case, I recommend that you retest this on a ‘clean’ machine, one with a freshly installed copy of macOS and Xcode and nothing else. I don't have the resources to do a clean install on a separate machine to investigate this, sorry. I suspect that’ll work, which then suggests that there’s something about the network configuration on your main Mac that’s causing this issue. You can use that as a basic of your investigation. For example, your main Mac might have some sort of firewall that’s causing this issue [1]. OTOH, if you still see this problem on a clean machine, that’s more interesting, suggesting that the issue is with your wider network environment. This happens on my home wifi, which is a standard Eero mesh system. The only custom network configuration I can think of is: IPv6 is disabled, I am using AdGuard home as my local DNS server. I tested with AdGuard disabled, same result. No firewall is set up, either in Eero or on my Mac It worked much better in early Xcode 15 betas, but I don't recall when it became unusable.