I haven't tried Wookie, since adding Clack+Woo was already a substantial change. Reading https://fukamachi.hashnode.dev/woo-a-high-performance-common... , where it compares with Wookie, I'm not sure if it would make a difference: it might be wrong, but "it says:

> Of course, this architecture also has its drawbacks as it works in a single thread, which means only one process can be executed at a time. When a response is being sent to one client, it is not possible to read another client's request.

... which for SSE seems to be similar to what the issue is with Woo. I wrote a bit more on it in https://github.com/fsmunoz/datastar-cl/blob/main/SSE-WOO-LIM... , and it can be more of a "me" problem than anything else, but to keep a SSE stream open, it doesn't play well with async models. That's why I added a with-sse-response macro that, unlike with-sse-connection, sends events without keeping the connection open.