slow(er) regressions (and QR)

I am in the process of upgrading my matlab from version R2009a to R2011b. While testing I observed that the regressions in R2011b are 2-3 times slower than the ones in R2009a and when I profiled the code I saw that the slowness comes from the qr function (line 75 in regress.m).

Has anyone else observed the same thing and is there a reason for this? Is there a way to speed up the regress function in R2011b?

Thanks in advance for your help,

Kostas