first off it only stays at 60 fps which is fine but in town it drops down to the 20s?

any ways the game lags still. i mean the fps is not stable at all? the game will i dont really know how to explain it will have hang ups? like when i was on my mount the game would hang for a second are two then go on? When there is a lot of players fighting it repeats that over and over? the game is really old so i know my pc should be able to run it. Is this normal for this game. Aslo when i pan the camra down to the ground i get 120 fps but when looking forward it only gos to 60 fps but is not stable?