我们如何才能提高Pivot表的性能？

Question

当我执行以下查询时，执行时间超过2分钟，如何提高数据透视表查询的性能或任何替代方案。这是我写的查询：

SELECT RBG AS 'RBG/SBG NAME',
       [PROJ] AS 'TOTAL NO OF PROJECT',
       [CONT] AS 'TOTAL NO OF CONTRACT',
       [CONTV] AS 'NO OF CONTRATORS',
       [BOQV] AS 'NO_OF_BOQ_CNT',
       [BILLV] AS 'NO_OF_BILL_CNT',
       [BILLAPPV] AS 'NO_OF_APP_BILL_CNT',
       [CONTC] AS 'NO OF CONSULTSNT',
       [BOQC] AS 'NO_OF_BOQ_CUN',
       [BILLC] AS 'NO_OF_BILL_CUN',
       [BILLAPPC] AS 'NO_OF_APP_BILL_CUN',
       [BOQ] AS 'TOTAL NO OF BOQ UPLOADED',
       [BILL] AS 'CONTRACTOR LEVEL',
       [BILLAPP] AS 'BILL APPROVED',
       ([BILL]+[BILLAPP]) AS 'TOTAL NO OF BILL' 
INTO TableB
FROM
  (SELECT RBG,
          PROJ_TYPE,
          ISNULL(PROJECT_CODE,0) AS PROJECT_CODE
   FROM TableA) S PIVOT(COUNT(PROJECT_CODE)
                        FOR PROJ_TYPE IN ([PROJ],[CONT],[CONTV],[BOQV],[BILLV],[BILLAPPV],[CONTC],[BOQC],[BILLC],[BILLAPPC],[BOQ],[BILL],[BILLAPP])) P