JDBC Large query optimisation

Hi,
We recover a large amount of data from an external database (SQLServer, about 1 million rows in JDBC).
However, we have treatment time issue.
This process takes more than 30 minutes whereas on a "classic" SQL Server Management Studio type request takes less than a minute.

While searching on the internet, I came across this article: http://makejavafaster.blogspot.com/2015/06/jdbc-fetch-size-performance.html
It explains how in Java, we can tweak the FetchSize parameter of the JDBC driver to optimize this kind of process.

Is there a way to access this JDBC parameter through the EnsLib.SQL.OutboundAdapter adapter?

If not, how do you deal with this kind of situation of large volumetry?

Code used in the EnsLib.SQL.OutboundAdapter :

Method GetResultSetView(pRequest As Ens.StringRequest, Output pResponse As Ens.StringResponse) As %Status
{
    
    set tStatus = $$$OK

    //Set ..Adapter.StatementAttrs = "fetchSize:200"  <-- Make no difference
    //Set ..Adapter.StatementAttrs = "Type=TYPE_FORWARD_ONLY" <-- Make no difference

    $$$ThrowOnError(..Adapter.SetAutoCommit(0))

    
    try{
        
        set pResponse = ##class(Ens.StringResponse).%New()
        set sqlGetView = "SELECT * from TableOfMillionsLignes"
        
        
        Set pSnap = ##class(EnsLib.SQL.Snapshot).%New()
        
        //dimension du snapshot
        // -1 = Max
        set pSnap.MaxRowsToGet = -1
        
        $$$ThrowOnError(..Adapter.ExecuteQuery(.pRS,sqlGetView))    
        
        //Most of the time is spend here
        $$$ThrowOnError(pSnap.ImportFromResultSet(pRS,0))

        
        $$$ThrowOnError(pSnap.%Save())
        
    
        set pResponse.StringValue = pSnap.%GblRef   
    }
    catch exp
    {
        Set tStatus = exp.AsStatus()
    }
    Quit tStatus
}