@OSX790: Have you got hardware acceleration working ? I tried 19,2 but not having any HA on my machine : i6700K headless + AMD RX 570). Actually on 20,2.
I'm still on Clover (5127) and faced this issue, but re-did the update from preboot installer then boot from preboot main hard drive and no more issue.
Was on 20B29, didn't see the update, so downloaded it from AS and installed it. First boot (after install) hanged, reboot + clear nvram (F11) via clover and it did the trick.
I had the lag with 10.13.3 and Nvidia web drivers. Updated today to supplemental 10.13.3 + latest Nvidia for supplemental :no lag this time (cross fingers).
You do not need to install both, AptioMemoryFix.efi replacing any OsxAptioFixXDrv-64.efi.
When removing EmuVariable, do not forget to delete rc.scripts in /etc/. When installing AptioMemoryFix.efi, do not forget to delete nvram.plist in Clover/EFI. Not needed then.
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