That sounded like there must be something wrong to me, so I double-checked today. My wife has a low-spec MacBook Air from ~2016 that I previously used for testing Unturned's Mac compatibility, before getting the newer M1 Mac for M1 compatibility testing. On that MacBook Air I was able to walk around one of the Buak towns facing the center mountain (most performance-intensive viewpoint) at around 20 fps low settings. Obviously 20 fps isn't ideal, but Buak is the most graphically-demanding map in the game by a long shot, and that's even having made optimizations to the base game specifically targeting the map. (other maps run much better on that laptop)
My gut expectation is that nowadays if anything runs at 1 fps there's probably something wrong. What platform are you on? Do you have any additional launch options specified in the Unturned properties window in Steam?