This may be the fix to high CPU usage, Replicated and Fixed multiple times
On my system I have never had any issue in this game with high CPU usage. But today I was able to replicate that issue consistently and fix it consistently on my PC.
For reference my CPU is a Ryzen 2700x. Basically:
1. Find "Windows Defender" on your task bar (Usually the up arrow at the bottom right)
2. Right-click Windows defender and click view security dashboard.
3. Click "App & browser control"
4. Click "Exploit protection settings"
5. Click "Program Settings"
6. Click "Add program to customize" then click "Choose exact file path"
7. Locate and find the "r5apex.exe" file in your Apex Legends root folder
8. Now click make sure every setting has "Override system settings" selected and click off for every setting then apply.
9. Restart game.
Let me know if it works.