Assassin's Creed Unity Low FPS And Performance Fix

AC Unity Low FPS And Performance Fix:
1. First Make Sure That Your GPU Driver Are Updated.
2. Disable TXAA.
3. Disable  PCSS Shadows / Soft Shadows.
4. Disable Vsync.
By Disabling These You Can Get Good FPS In Game Although The Game May Become Little Bit Blurry.
 

Assassin's Creed Unity Stuttering Fix

AC Unity Stuttering Fix:
Make Sure That Your GPU Matches The Minimum Requirements Of The Game. Otherwise Try To Update Your Drivers Download IOBit Driver Booster From Here It Can Update Your Drivers.
If You Are Using Laptop Then Make Sure That You Are Running Game On Dedicated Video Memory.

Assassin's Creed Unity Update + Patch

AC Unity Update + Patch:
Assassin's Creed Unity Update v1.5 + Patch
Size : 73 MB 
Download Link
 

Assassin's Creed Unity Game Has Stopped Working Fix

AC Unity Game Has Stopped Working Fix:
1. Verify Your Game Files.
2. Try Installing A Previous Version Of Your Graphics Card Driver.
3. Make Sure That You Are Not Running Any Third Party Application Like MSI Afterburner.
4. Disable Overlay Option From Uplay Settings.