No, not in short term but you are loosing power due to the valves are not fully closed.
You should either take the hydraulic lifters out and wash them in alcohol. or better is to exchange them to new ones. they usally don't cost mutch, but there is a little time consuming to exchange them.
But this "problem" can also accure when you just have changed oil due to air have come in to the lifters, or if you have changed to a oil that has to low density to make the lifters to work as they should.