Since SPDY offers the benefits of multi-user loading, I would recommend a client-side testing tool such as PhantomJS and compute document.onload times to fully measure loaded resources and JavaScript execution. ApacheBench will measure server response time (excluding JS and related files, and I'm not sure if it reviews TLS handshakes on every connection.
Here's a test that evaluates 350 queries: http://www.httpvshttps.com/
source share