I have already run a blitz.io rush against it. The old server could handle about 34 users per second before it started to kick errors. This one went up to 583 users per second and it only stopped there because I cut off the server response time at 5 seconds (so, while the response was slow, there were no errors and the pages were served in under 5 seconds).
Hit rate was 9/sec, now it is 70/sec. (One of my wordpress sites is at 845 hits/sec). So, I think we sill see this perform much better and there still may be room for improvement.