This is correct. I have worked with jews and not a single one showed anything more than average aptitude. This is also true of asians. I am always taken aback at just how stupid asians are in general with respect to general cognitive capability. They are extremely polite (to your face, behind your back, way racist) and submit to authority, but intellectually dissapointing. All the smart people that I have worked with were white. Anecdotally that checks out.