Slipperiness may be the wrong term. It certainly does give better protection at high rpm though.
Some years ago I used to fly RC model airplanes with methanol based fueled 2 cycle engines. They'd run at 15,000 to 20,000 rpm. With synthetic lubricants, we'd be able to get an extra 2 to 3 thousand rpm more and it would run that way for a full tank whereas the regular oils would allow the engine to overheat and stop. Based on what we did, I'm convinced that synthetics offer superior performance. Given the quality of dino oils though, I'm not convinced that normal engines under normal driving conditions actually need it. If you like to play in the high rpm ranges, go for it.