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Are you using VMFS 6 datastores? If so, there is known issue with W10 1809/1903 and snapshots which has now been resolved with vSphere 6.5 Update 3 but not with vSphere 6.7 as yet.
One workaround at present for vSphere 6.7 is to use VMFS 5 datastores until the update for vSphere 6.7 is available.
Thank you for your reply. I am using vSphere 6.7 and VMFS 6.
I just moved the VM to VMFS 5 Datastore and it is ok now, they have a normal booting time.
Or you could clone it instead of making snapshots. Only makes sense if you have a good deduping SAN unit though, but at least you don't have to have and vmfs 5 luns.