Unfortunetly Ubisoft are too lazy to fix the frame rate issues

1) open game
2) alt tab to desktop (with game open)
3) open task manager
4) select the details tab in the task manager
5) right click on the Assainsins creed game
6) set affinety
7) tick 1 CPU core only (make sure the rest are unticked)
8) close affinty menu
9) right click on the Assainsins creed game
10) set affinety
11) tick all cores
12) close task manager

On the last sequence end mission you need V-sync on or run the game on 1 core using the above method as the game as a bug which stops you completeing the game

its a shame ubisoft can't patch this. they recently added steam acheivements so they should patch this

This is the best game in the Ezio trilogy. The freestyle counter combat makes you feel like a true master assassin as you take down an army of enemies alone. You play as charming and everyone's favorite Ezio. The game takes place in Rome during the Renaissance. The map is huge with tons of content and missions and very little repetitiveness. The music is stunning and changes according to the location you are in the city. Playing this game makes you feel like you are actually living in Rome, the crowd is reactive and the game captures the essence and landmarks of the city beautifully. The game is filled to the brim with guild missions and assassination contracts. The flashback missions set in Florence show what happened to the love story of Ezio and Christina which is a tear-jerker. You can now recruit people and make them Assassins by sending them on missions or calling them for help whenever needed. Leonardo has 5 missions on destroying war machines that are like super-weapons for that era, these missions are tough and you need to plan your way into compounds without getting noticed. I have played this game thrice and yet I never have enough of this game. I actually passed my History exam on Renaissance by playing this game as you meet all the famous characters of that era.

Yet another title left to rot by Ubisoft. If you can get it working you'll find the game is one of the best AC ever made.