Blowbacks can transmit a pretty sharp whack as the slide strikes the slide stop of the frame. Locked breech pistols typically recoil much softer because of their much slower moving slides.
Slide slap should not be confused with the recoil reaction of launching the projectile. A revolver's recoil is almost limited to the launching of the projectile. In an automatic, some of the projectile's recoil is absorbed by the springs in the gun, however, if the slide hits the stop with a lot of speed, it's going to be felt in the hand of the shooter. Makarovs, P64's, and PPK's are notorious for having painful recoil because of slide slap.