Overall the results were pretty encouraging, especially since we made no real effort to optimize for performance. So I treat our results as upper bounds on what is possible. We are preparing a paper for this years Freenix track at Usenix technical that includes a discussion of the results. There is always going to be a performance hit for security. We have to accept that.
Nothing is for free.
With that said, however, we have been running SELinux for a while and there is no perceivable impact on users. We don't run any of the applications that you mention though.