Physics Maps Lag error

(system specs) I have 3 gb of ram a 3.4ghz Pentium D processor with an Nvidia 8600 gt graphics card with 512 mb and windows 7, but still when ever I got into a physics map eg. phys_house it lags like crazy…but all other maps are flawless

phys_house is broken. An update broke the map.

ok so then every phys map is broken?

Yup.

Only ones that work are Phys_town and Phys_temple