Uniformly scales the model of the entity, if the entity is a Player or an NPC the hitboxes will be scaled as well.

To resize the entity non-uniformly, along any axis, use Entity:EnableMatrix instead.

For some entities (Such as prop_physics and anim type Scripted Entities), calling Entity:Activate after this will scale the collision bounds and PhysObj as well; be wary as there's no optimization being done internally and highly complex collision models might crash the server.

Client-side trace detection seems to mess up if deltaTime is set to anything but zero. A very small decimal can be used instead of zero to solve this issue.

If your old scales are wrong, use Entity:SetLegacyTransform as a quick fix.