Or simply too much/too stiff grease in the freehub.
If it was me, unless the f/h is so stiff that it makes the chain sag while coasting, I’d just ignore it and keep riding. There’s a good chance that a bit of break-in will fix the issue.
If it really annoyed me, I’d remove the wheel from the bike and spin the cassette by hand to see if I could detect any excess resistance.
If I did, next step I’d take would be to remove f/h off bike and flush it.
If that doesn’t fix things, next step would be either f/h disassembly or replacement.