text: -- FROM: https://www.sqlskills.com/blogs/paul/wait-statistics-or-please-tell-me-where-it-hurts/
  
  WITH [Waits] AS
      (SELECT
          [wait_type],
          [wait_time_ms] / 1000.0 AS [WaitS],
          ([wait_time_ms] - [signal_wait_time_ms]) / 1000.0 AS [ResourceS],
          [signal_wait_time_ms] / 1000.0 AS [SignalS],
          [waiting_tasks_count] AS [WaitCount],
         100.0 * [wait_time_ms] / SUM ([wait_time_ms]) OVER() AS [Percentage],
          ROW_NUMBER() OVER(ORDER BY [wait_time_ms] DESC) AS [RowNum]
      FROM sys.dm_os_wait_stats
      WHERE [wait_type] NOT IN (
          N'BROKER_EVENTHANDLER', N'BROKER_RECEIVE_WAITFOR',
          N'BROKER_TASK_STOP', N'BROKER_TO_FLUSH',
          N'BROKER_TRANSMITTER', N'CHECKPOINT_QUEUE',
          N'CHKPT', N'CLR_AUTO_EVENT',
          N'CLR_MANUAL_EVENT', N'CLR_SEMAPHORE',
   
          -- Maybe uncomment these four if you have mirroring issues
          N'DBMIRROR_DBM_EVENT', N'DBMIRROR_EVENTS_QUEUE',
          N'DBMIRROR_WORKER_QUEUE', N'DBMIRRORING_CMD',
   
          N'DIRTY_PAGE_POLL', N'DISPATCHER_QUEUE_SEMAPHORE',
          N'EXECSYNC', N'FSAGENT',
          N'FT_IFTS_SCHEDULER_IDLE_WAIT', N'FT_IFTSHC_MUTEX',
   
          -- Maybe uncomment these six if you have AG issues
          N'HADR_CLUSAPI_CALL', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION',
          N'HADR_LOGCAPTURE_WAIT', N'HADR_NOTIFICATION_DEQUEUE',
          N'HADR_TIMER_TASK', N'HADR_WORK_QUEUE',
   
          N'KSOURCE_WAKEUP', N'LAZYWRITER_SLEEP',
          N'LOGMGR_QUEUE', N'MEMORY_ALLOCATION_EXT',
          N'ONDEMAND_TASK_QUEUE',
          N'PREEMPTIVE_XE_GETTARGETSTATE',
          N'PWAIT_ALL_COMPONENTS_INITIALIZED',
          N'PWAIT_DIRECTLOGCONSUMER_GETNEXT',
          N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP', N'QDS_ASYNC_QUEUE',
          N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP',
          N'QDS_SHUTDOWN_QUEUE', N'REDO_THREAD_PENDING_WORK',
          N'REQUEST_FOR_DEADLOCK_SEARCH', N'RESOURCE_QUEUE',
          N'SERVER_IDLE_CHECK', N'SLEEP_BPOOL_FLUSH',
          N'SLEEP_DBSTARTUP', N'SLEEP_DCOMSTARTUP',
          N'SLEEP_MASTERDBREADY', N'SLEEP_MASTERMDREADY',
          N'SLEEP_MASTERUPGRADED', N'SLEEP_MSDBSTARTUP',
          N'SLEEP_SYSTEMTASK', N'SLEEP_TASK',
          N'SLEEP_TEMPDBSTARTUP', N'SNI_HTTP_ACCEPT',
          N'SP_SERVER_DIAGNOSTICS_SLEEP', N'SQLTRACE_BUFFER_FLUSH',
          N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP',
          N'SQLTRACE_WAIT_ENTRIES', N'WAIT_FOR_RESULTS',
          N'WAITFOR', N'WAITFOR_TASKSHUTDOWN',
          N'WAIT_XTP_RECOVERY',
          N'WAIT_XTP_HOST_WAIT', N'WAIT_XTP_OFFLINE_CKPT_NEW_LOG',
          N'WAIT_XTP_CKPT_CLOSE', N'XE_DISPATCHER_JOIN',
          N'XE_DISPATCHER_WAIT', N'XE_TIMER_EVENT')
      AND [waiting_tasks_count] > 0
      )
  SELECT
      MAX ([W1].[wait_type]) AS [WaitType],
      --CAST (MAX ([W1].[WaitS]) AS DECIMAL (16,2)) AS [Wait_S],
      --CAST (MAX ([W1].[ResourceS]) AS DECIMAL (16,2)) AS [Resource_S],
      --CAST (MAX ([W1].[SignalS]) AS DECIMAL (16,2)) AS [Signal_S],
      MAX ([W1].[WaitCount]) AS [WaitCount]--,
      --CAST (MAX ([W1].[Percentage]) AS DECIMAL (5,2)) AS [Percentage],
      --CAST ((MAX ([W1].[WaitS]) / MAX ([W1].[WaitCount])) AS DECIMAL (16,4)) AS [AvgWait_S],
      --CAST ((MAX ([W1].[ResourceS]) / MAX ([W1].[WaitCount])) AS DECIMAL (16,4)) AS [AvgRes_S],
      --CAST ((MAX ([W1].[SignalS]) / MAX ([W1].[WaitCount])) AS DECIMAL (16,4)) AS [AvgSig_S],
      --CAST ('https://www.sqlskills.com/help/waits/' + MAX ([W1].[wait_type]) as XML) AS [Help/Info URL]
  FROM [Waits] AS [W1]
  INNER JOIN [Waits] AS [W2]
      ON [W2].[RowNum] <= [W1].[RowNum]
  GROUP BY [W1].[RowNum]
  HAVING SUM ([W2].[Percentage]) - MAX( [W1].[Percentage] ) < 95; -- percentage threshold
  GO