The ones that only get used if the roads are closed and cabin fever sets in. The boots are probably not fitting right, they're probably not the right flex for the skier's weight, and they're probably buried under the dead Christmas tree lights.
There's nothing wrong with them.
Now, there is a way to make them just -slightly- better.
Most "urban" use is going to involve at least one crossing of asphalt, concrete, sanded area or some combination of those.
Unfortunately, ptex is softer than all those and gets pitted and fuzzed up with little hairs.
Scrape the fuzz off and they will glide better. A cheap steel scraper like Swix one sold by REI and others
is optimal (sharp and rigid, gets it done in two passes) but one can improvise almost anything.