What are your full system specifications?
What OS and AMD Driver are you using?
The R7 270X is a discrete graphics card, it's not possible to use the Integrated GPU, i think you are getting confused with switchable graphics.
Can you use system restore to regain better performance in this title?
Can you try an older AMD driver to see if that improves performance?
Can you lower the image quality settings?
Can you run Task Manager to see if anything is using up system memory or CPU cycles?
Have you mentioned the issue on the Total War forums?
sorry been out of town.
Windows 10 Home
Intel Core I5 4690K 3.5GHZ
OS Build 10586.29
64bit OS and x64 based processor
Radeon Software version 15.11
AMD R9 270X
Checked Task Manager already, nothing there that would cause issue, lowered graphics settings in game to lowest quality and still have issue. Mentioned issue on TW forums but no help really. All drivers are up to date. How would I go about reverting to an older AMD driver? When you say system restore, do you mean the whole pc?