200000 records converting from data table to csv facing issue in deployment server

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C#

I am converting 200000 records converting from data table to csv in my local VM(Azure Cluster) server it's taken 36 seconds and after deployed to Azure server it's taken 1 min 20 sec ..

Can you please suggest on this

How to resolve this.

What I have tried:

StringBuilder stringBuilder = new StringBuilder();
// Only return Null if there is no structure.
if (dataTable.Columns.Count == 0)
return null;

foreach (object col in dataTable.Columns)
{
if (col == null)
stringBuilder.Append(",");
else
stringBuilder.Append("\"" + col.ToString().Replace(@"""", @"""""") + "\",");
}
stringBuilder.Replace(",", Environment.NewLine, stringBuilder.Length - 1, 1);
foreach (DataRow dr in dataTable.Rows)
{
foreach (object column in dr.ItemArray)
{
if (column == null)
stringBuilder.Append(",");
else
stringBuilder.Append("\"" + column.ToString().Replace(@"""", @"""""") + "\",");
}
stringBuilder.Replace(",", Environment.NewLine, stringBuilder.Length - 1, 1);
}