Hello @dolpli008 sorry to hear of your recent lower FPS in-game and high CPU usage, but thanks for letting us know what steps you have tried to try and resolve this and improve your performance.
I have a few other suggestions I would like you to try to help resolve this, some of these suggestions may contradict your power plan changes >>
-Check your power options in Windows and set it to High Performance in case of any CPU throttling. Open your Windows Settings, type 'Power Options, select 'Additional Power Settings', then select a High-Performance plan.
Please also try creating a new power plan in these options and set your maximum use of your CPU to 90% or another lower value, this can prevent your CPU from running at high usage, and will make your GPU work harder instead when playing the game, putting less strain on the CPU.
-Open the Task Manager tool on your PC, and look for any running programs other than the game and game launcher. Close down all of these programs, except the game and game launcher, then 'clean boot' your computer, and restart the game to make sure you free up your CPU usage just for the game >
https://support.ubisoft.com/en-GB/Article/000063761
-Test the CPU usage after lowering some settings. In the games menu and your GPU control software, enable Vsync, lower your FPS usage, and lower your graphical preset. Running games on high or ultra with maximum FPS, can cause strain not only on your Vram but CPU too
-Update all your game, game launcher, Windows, graphics card drivers, and peripheral drivers, as updating your drivers may eliminate compatibility issues or bugs that can sometimes cause increased CPU usage
If after running through all of these steps you are still experiencing high CPU rates, please make a private support ticket with us and send us your system files so we can send these to our Siege team for investigation.
You can contact us here > https://www.ubisoft.com/help/contact
Please attach the following information to your ticket to aid us in our investigation >
Dxdiag file > https://ubi.li/msrxL
Msinfo file > https://ubi.li/lmiCE