Inexplicably slow Kaby Lake setup on 10.13

[Martinos89]

I've got a Kaby Lake 7600K, GTX 1080, 16GB RAM, 960 PRO nvme SSD ... A nice recipe for a very fast PC.
Except, on MacOS, it's far from. It feels like I'm on a 2010 Macbook running GTA V.

I have noticeable lags on:
Typing text, moving the mouse, dragging windows, watching video ...

I remember having a very fast system back when I was on 10.12. So something along the way went wrong

I've tried multiple things to fix it:

• Following the native power management guide. (First using ssdtPRGen.sh, then switched to SSDT-XCPM) Power management seems to be working, but doesn't impact my performance in the positive way.
• MacOS update to multiple newer versions, each time hoping it would be fixed (10.13.2, supplementals, 10.13.3)
• Clean install
• Clover updates
• Clover upgrade to OsxAptioFix3Drv-64.efi (and remove emuvariableuefi-64.efi)
• Enabled/Disabled iGPU in BIOS

Problem is, I can't put my finger on the exact problem.
Is it a MacOS update? Is it the new 4K 30-bit monitor I'm using? Is it a magical unicorn?
I have no clue ...

The guys in this thread seem to have the same problem, but without any solution:
https://www.tonymacx86.com/threads/desktop-feels-laggy-and-chrome-very-slow.236081/


So ... My questions to you:

1. What can I try that I haven't tried before?
2. Are you an expert willing to have a look over a remote connection? This is my workstation so I'm even willing to pay for a solution (paypal)

Thank you!




-------------------

Hardware:

• ASRock Z270 Gaming-ITX/AC
• Intel Core i5 7600K
• Samsung 960 PRO 512GB
• MSI GeForce GTX 1080 GAMING X 8G

Versions:

• BIOS 2.30 (https://www.asrock.com/MB/Intel/Fatal1ty Z270 Gaming-ITXac/index.asp#BIOS)
• macOS 10.13.3
• NVIDIA 387.10.10.10.25.156 web driver
• Clover 4392

Kexts in S/L/E:

• AppleALC.kext
• FakePCIID_XHCIMux.kext
• FakePCIID.kext
• FakeSMC_ACPISensors.kext
• FakeSMC_CPUSensors.kext
• FakeSMC_LPCSensors.kext
• FakeSMC.kext
• IntelMausiEthernet.kext
• Lilu.kext
• USBInjectAll.kext
• XHCI-200-series-injector.kext

SSDTs:

• SSDT-UIAC.aml (usb-inject-all)
• SSDT-XCPM.aml (power management)

 

[Martinos89]

Extra info:
I'm on the 18,3 definition.
I'm using HFS+, not APFS

 

[hackmac101]

It a known issue. Downgrade will fix.
https://sourceforge.net/p/nvidiagraphicsfixup/tickets/10/