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This console variable is used to differentiate between which props should be made on the server and which props should be made on the client. If an object does not have "Force server-side" on, and its oriented bounding box's volume is less than the cubic volume with the side length of sv_pushaway_clientside_size, it will be created on the client, rather than the server. Remember that servers can set their own value for the variable, so even if a physics object is huge and is an important part of the gameplay, it should be marked as "Force server-side."