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There is a bug if you have 1809 on vsphere with a snapshot (mcs). https://www.vcloudnine.de/poor-performance-with-windows-10-2019-1809-on-vmfs-6/?cn-reloaded=1

hmmm thanks @Chris Twiest I think it's image related - performance is OK other than for this one weird magical image - haven't seen so much head scratching in a long time 🙂

i was gonna mention to vsphere bug too

it was a fun one - Active Directory processing issue which only happens when a gpupdate /force is actioned on machine boot....which is something that BIS-F does....over 2 minutes to process a GPO run, back to the AD guys 🙂