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.

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