sqlserver-2012-thinkphp connection to SQL Server is particularly slow

Does anyone know why it is so slow to connect SQL Server with thinkphp? Configuration succeeded, wrote a method can fetch data, but particularly slow, the web has been in the circle, what is the matter?

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Does anyone know why it is so slow to connect SQL Server with thinkphp? Configuration succeeded, wrote a method can fetch data, but particularly slow, the web has been in the circle, what is the matter?

Add: The version is thinkphp3.2.3, with the configuration of TP comes with the connection SQL Server is very slow, but write a file separately, with PDO connection is no problem, tp3.2.3 is not also PDO connection? What causes it, and does the great God know?

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