All wrecked car and some normal car models have a lot of duplicate vertices much more than item models. I haven't checked all the models, maybe there are errors somewhere else. Maybe it slows down performance.
Where are the painkillers? There are no models in the game, no sprites when using 3D models.
models_X\vehicles
ModernCarSMASH_Front 118
ModernCarSMASH_Left 28
ModernCarSMASH_Rear 118
ModernCarSMAS_Right 32
Trailer 4
Vehicle_StepVanCrash 27
VehicleStepVanCRASH_Rear 27
VehicleStepVanCRASH_Right 20
VehicleStepVanCRASH_Front 13
VehicleStepVanCRASH_Left 20
vehicle_utilitytrailer 4
vehicle_utilitytrailercover 4
Vehicles_CarNormal 135
Vehicles_CarNormalLights 135
Vehicles_CarNormalLightsSMASH_Front 32
Vehicles_CarNormalLightsSMASH_Left 32
Vehicles_CarNormalLightsSMASH_Rear 34
Vehicles_CarNormalLightsSMASH_Right 38
Vehicles_CarNormalSMASH_Front 31
Vehicles_CarNormalSMASH_Left 107
Vehicles_CarNormalSMASH_Rear 47
Vehicles_CarNormalSMASH_Right 37
Vehicles_CarStationWagon 126
Vehicles_CarStationWagonSMASH_Front 109
Vehicles_CarStationWagonSMASH_Left 31
Vehicles_CarStationWagonSMASH_Rear 77
Vehicles_CarStationWagonSMASH_Right 99
Vehicles_CarTaxi 135
Vehicles_LuxuryCar 124
Vehicles_LuxuryCarSMASH_Front 77
Vehicles_LuxuryCarSMASH_Left 25
Vehicles_LuxuryCarSMASH_Rear 38
Vehicles_LuxuryCarSMASH_Right 24
Vehicles_ModernCar02 132
Vehicles_ModernCar02SMASH_Front 103
Vehicles_ModernCar02SMASH_Left 102
Vehicles_ModernCar02SMASH_Rear 100
Vehicles_ModernCar02SMASH_Right 103
Vehicles_ModernCarSMASH_Front 119
Vehicles_ModernCarSMASH_Left 32
Vehicles_ModernCarSMASH_Rear 118
Vehicles_ModernCarSMASH_Right 38
Vehicles_OffRoadCRASH_Front 96
Vehicles_OffRoadCRASH_Left 109
Vehicles_OffRoadCRASH_Rear 104
Vehicles_OffRoadCRASH_Right 110
Vehicles_OffRoadCRASH_Front 69
Vehicles_OffRoadCRASH_Left 79
Vehicles_OffRoadCRASH_Rear 90
Vehicles_OffRoadCRASH_Right 79
Vehicles_PickUpTruckLightsCRASH_Front 69
Vehicles_PickUpTruckLightsCRASH_Left 79
Vehicles_PickUpTruckLightsCRASH_Rear 90
Vehicles_PickUpTruckLightsCRASH_Right 79
Vehicles_PickUpVanCRASH_Front 10
Vehicles_PickUpVanCRASH_Left 19
Vehicles_PickUpVanCRASH_Rear 20
Vehicles_PickUpVanCRASH_Right 18
Vehicles_PickUpVanLightsCRASH_Front 13
Vehicles_PickUpVanLightsCRASH_Left 19
Vehicles_PickUpVanLightsCRASH_Rear 34
Vehicles_PickUpVanLightsCRASH_Right 17
Vehicles_SmallCar02CRASH_Front 31
Vehicles_SmallCar02CRASH_Left 35
Vehicles_SmallCar02CRASH_Right 38
Vehicles_SmallCar02SMASH_Rear 93
Vehicles_SmallCarCRASH_Left 26
Vehicles_SmallCarSMASH_Front 25
Vehicles_SmallCarSMASH_Rear 26
Vehicles_SmallCarSMASH_Right 27
Vehicles_SUVCRASH_Front 58
Vehicles_SUVCRASH_Left 66
Vehicles_SUVCRASH_Rear tired of counting
Vehicles_SUVCRASH_Right tired of counting
models_X/WorldItems
CarParts_SidePanel (duplicate vertices 6) (missing faces 2)
RedRadish (duplicate vertices 6) (missing faces 2)
GravelBag (missing faces 1)
BloomingBroccoli (missing faces 1)
=======================================
TrapCage (duplicate vertices 20)
RippedSheets (duplicate vertices 18)
Pasta (duplicate vertices 17)
Key (duplicate vertices 16)
BreadSlices (duplicate vertices 15)
Rope (duplicate vertices 13)
GrapeLeaves (duplicate vertices 12)
CannedSardinesOpen (duplicate vertices 11)
SutureNeedleHolder (duplicate vertices 9)
WeddingVeil_Groung (duplicate vertices 9)
WatchClassic (duplicate vertices 7)
CommonMallow (duplicate vertices 6)
JokeKnife_Ground (duplicate vertices 6)
DoorFrame (duplicate vertices 5)
SteelKnuckle (duplicate vertices 4)
BakingSoda (duplicate vertices 4)
Leek (duplicate vertices 4)
Tweezers (duplicate vertices 4)
CarKeys (duplicate vertices 3)
CraftedTimer (duplicate vertices 3)
TrapSnare (duplicate vertices 3)
UnusableWood (duplicate vertices 3)
Bandage (duplicate vertices 2)
Chocolate (duplicate vertices 2)
CraftedTrigger (duplicate vertices 2)
DeadBird (duplicate vertices 2)
FishFingers (duplicate vertices 2)
FoundationMakeup (duplicate vertices 2)
Ginseng (duplicate vertices 2)
GriddlePanFriedVegetables (duplicate vertices 2)
HandGunAmmoBox (duplicate vertices 2)
Lettuce (duplicate vertices 2)
MakeupFoundation (duplicate vertices 2)
MotionSensor (duplicate vertices 2)
SewingBox (duplicate vertices 2)
ToothBrush (duplicate vertices 2)
TrapBox (duplicate vertices 2)
Apple (duplicate vertices 1)
BalaclavaFace (duplicate vertices 1)
CarBumper (duplicate vertices 1)
CarDoor (duplicate vertices 1)
CheeseSandwich (duplicate vertices 1)
DeadRabbit (duplicate vertices 1)
ElectronicsScrap (duplicate vertices 1)
Kettle (duplicate vertices 1)
NoiseMakerSensor (duplicate vertices 1)
SmallAnimalMeat (duplicate vertices 1)
PeanutButterSandwich (duplicate vertices 1)
SpiffoPlushie (duplicate vertices 1)
models_X/WorldItems/Clothing
Bob_Jacket_Ground (duplicate vertices 1) (missing faces 1)
Bob_WeddingJacket_Ground (duplicate vertices 1) (missing faces 1)
======================================
Bob_Dungarees_Ground (duplicate vertices 52)
Bob_GihillieTrousers_Ground (duplicate vertices 32)
Bob_GhillieTop_Ground (duplicate vertices 10)
Bob_WeddingDress_Ground (duplicate vertices 9)
BowlingBallBag_Ground (duplicate vertices 7)
Bob_HospitalGown_Ground (duplicate vertices 6)
Bob_SpiffoSuit_Ground (duplicate vertices 5)
Bob_TShirt_Ground (duplicate vertices 5)
Bob_Hazmat_Ground (duplicate vertices 5)
Bob_Hoodie_Ground (duplicate vertices 4)
Bob_Shirt_Ground 4 (duplicate vertices)
ALICE_Pack_Ground (duplicate vertices 1)
Bob_BoilerSuit_Ground (duplicate vertices 1)
Bob_Dress_Long_Ground (duplicate vertices 1)
Bob_Dress_Mid_Ground (duplicate vertices 1)
Bob_Dress_Short_Ground (duplicate vertices 1)
Female_Bra_Strapless_White (duplicate vertices 1)
Female_Bra_Straps_White (duplicate vertices 1)