Can you post wires? they don't look lowpoly. If I'm correct the 7.500 vertices from the BlenderRender window translates to about 15.000 triangles, so 7.500 tris for a robot without arms and only half legs. Guesstimating you have a total of 12.000 triangles per robot. 12.000 triangles is way, way much for a simple robot…