From what I read, it does slow down your charging time. Not a lot but it does somewhat. Sometimes it depends on the quality of the extension.
I have a 6 foot extension added to my cell phone charging cord. Is my imagination or does this slow down the charging time?
I was taught good table manners as a child and they followed me into old age. One thing that I do is always put on a red t-shirt when I'm eating pasta with red sauce. Can't see the stains.