The optimization is horrible, the moment I step insde the map, the amount of lag is quite huge for a such a small map.
From the first view, I can tell this is one of your first hammer maps and it is a testing map, which is something mappers usually keep it to themselfs as well... it is a testing map, it is where you play around with things.

I would recommend looking up some tutorials (basics, lighitng, cubemaps and so on) and some info for optimization.

Good luck

In the Hammer editor, I've been using the prop squarebeam_off.mdl for the tile frame, then I added square tiles with a floor texture and twisted them to try and create a destructed look. I twisted the glass walls the same.

what did you use to make this test