P1LGRIM, I understand my card has native support, only tried the Web Drivers to see if they would clear the lag since under 10.13.4, many had solved the lag issue, but no improvement for me.
After all these months, still running Sierra because HS is lagging. And now, more than ever, I need to upgrade to FCPX 10.4.1 which requires HS. Spent countless hours upgrading to HS.
Are NvidiaGraphicsFixup and Nvidiagraphicscleanup the same?
So I am back with native drivers on a clean install of 10.13.4 along with the NvidiaGraphicsFixup + Lilu kexts.
I had them in the S/L/E, then moved them in the L/E and now they are EFI/Clover/Kexts/Other folder, with no improvement relative to where they are located.
I do feel browsing the web is now more fluid but watching Youtube videos is still lagging and worst after my system has been running half and hour and more.
Currently using an iMac18,3 profile (no improvement to iMac14,2) since I do get the black screen on the iMac17,1 and haven't got my head around solving this issue. NvidiaGraphicsFixup + Lilu kexts are in the EFI/Clover/Kexts/Other folder.
Jamesbond007, I got to get my head around your fix and might give it a try.
LensJockey, I would really like to get an AMD graphics card but the supported ones are quite expensive, will see once 10.13.5 be available.
Thanks everyone, I appreciate your help.