Dynam, If you use the UIC in the .TRAN card in case 1, to avoid permitting the ITS, you should see a difference -- and slowness. I've no idea what's in the IC model. But whatever is in there is likely a part of the issue. This is also probably why adding a ground to the IC helps out. When you see something like that, then you know that there is something going on in the IC model that you can't see that is causing some troubles.
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