Same Problem here:
MBPR 2012, 16GB RAM, 1TB SSD.
Memory used was around 12.5 GB (so no memory issue)
Swap used: 97.8 MB. i.e. no swapping.
Compressed memory: 164.2 MB i.e. CPU usage for decompressing RAM is minimal.
CPU UTILIZATION: 40-50 % min 170% total between kernel_task, WindowServer, Google Chrome helper ... etc. One of them will hit 100% when I am using the system.
CPU starts throttling back. Temperatures are at 103C. Not kidding. I should use it to make tea. And I am not even compiling anything.
And HW acceleration is ON.
OS: 10.13.1. !0.13.2 is slightly better. It was fine before High Sierra. I was running multiple videos and Adobe Lightroom, etc.
Anything brings the system to a very bad state. Some issues I saw:
1. System freezes on a regular basis. Requires reboot.
2. Clicking on an app does not bring its windows to the top of the screen for a long time. Sometimes never.
3. Dragging windows may not even work.
4. Windows dragging is very jerky when it works.
5. Time Capsule backup brings the system down to its knees.
6. Appreciable delay while typing: MS Word, text edit, anything. This looks like a TTY terminal during the mainframe days before a class final project.
7. Can't Skype or do Hangout, Webex, etc. and take notes at the same time.
8. Switching between logon screens takes a long time.
9. Login can take a long time.It does some rotation thing. Just make it work before making in fancy.
And I am not even a QA engineer. This is the worst release from Apple. EVER.
10.13.2: A bit better.