Modern Auth and Unattended Scripts in Exchange Online PowerShell V2

Actually, in relation to my Feb 21 2021 07:45 PM question.  The issue may not be caused by the import-module.  It seems the old connection method used in the web app ( using WSManConnectionInfo) had similar connection delays (around 12 seconds for an initial connection) but somehow the connection was being cached so subsequent "connection" calls were much faster (~10x).  Apparently that's just not happening for me with the new method as subsequent calls all still take over 12 seconds.

I am using:

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InitialSessionState initSession = InitialSessionState.CreateDefault();
initSession.ImportPSModule(new[] { "ExchangeOnlineManagement" });
Runspace rs = RunspaceFactory.CreateRunspace(initSession);
rs.Open();
using (PowerShell session = PowerShell.Create())
{

session.Runspace = rs;

session.AddCommand("Connect-ExchangeOnline");
session.AddParameter("CommandName", cmdlet.CommandText); // optimise load time by limiting cmds
session.AddParameter("CertificateThumbprint", ActiveDirectory.O365OAuth2CertificateThumbprint);
session.AddParameter("AppID", ActiveDirectory.O365OAuth2AppID);
session.AddParameter("Organization", ActiveDirectory.O365OAuth2Organization);

if (ActiveDirectory.O365RemotePSConnectionUseIEConfigProxy == "Y")
{
session.AddParameter("PSSessionOption", new PSSessionOption() { ProxyAccessType = ProxyAccessType.IEConfig });
}

session.Invoke();

session.Commands.Clear();
session.AddCommand(cmdlet);
output = session.Invoke();
}