1. First class streaming support - All view handlers are now enabled to stream responses back to the browser. This eliminates the need for callbacks, but more importantly carries a noticeable performance improvement.
2. Startup time compiled router - There is a new router that analyzes routes at runtime and builds a routing function. This solves a number of historical problems, but also includes a performance increase.

@app.signal("foo.bar.<thing>")
async def signal_handler(thing, **kwargs):
    print(f"[signal_handler] {thing=}", kwargs)

async def wait_for_event(app):
    while True:
        print("> waiting")
        await app.event("foo.bar.*")
        print("> event found\n")

@app.after_server_start
async def after_server_start(app, loop):
    app.add_task(wait_for_event(app))

@app.get("/")
async def trigger(request):
    await app.dispatch("foo.bar.baz")
    return response.text("Done.")