SQL 2014 - SSRS and SQL has high CPU usage > 30% Memory usage over 500mb

• This is happening because you have imported an old report from a previous version of SSRS that is referencing a subreport or location that does not exist
• Open each on of your imported reports and check for any invalid subreport links and update them
• Edit each one of the old reports in the 2014 SSRS Editor and save them in the new editor
• You should notice the CPU usage drop immediately once you find the offending report

you can use this query to view the CPU performance of your SQL

https://mssqlwiki.com/2010/11/30/how-to-find-sql-server-and-system-cpu-usage-history/

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DECLARE @ts_now bigint

SELECT @ts_now = cpu_ticks / (cpu_ticks/ms_ticks)  FROM sys.dm_os_sys_info

SELECT top 20 record_id, EventTime, 

  CASE WHEN system_cpu_utilization_post_sp2 IS NOT NULL THEN system_cpu_utilization_post_sp2 ELSE system_cpu_utilization_pre_sp2 END AS system_cpu_utilization, 

  CASE WHEN sql_cpu_utilization_post_sp2 IS NOT NULL THEN sql_cpu_utilization_post_sp2 ELSE sql_cpu_utilization_pre_sp2 END AS sql_cpu_utilization

FROM 

(

  SELECT 

    record.value('(Record/@id)[1]', 'int') AS record_id,

    DATEADD (ms, -1 * (@ts_now - [timestamp]), GETDATE()) AS EventTime,

    100-record.value('(Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') AS system_cpu_utilization_post_sp2,

    record.value('(Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int') AS sql_cpu_utilization_post_sp2 , 

    100-record.value('(Record/SchedluerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') AS system_cpu_utilization_pre_sp2,

    record.value('(Record/SchedluerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int') AS sql_cpu_utilization_pre_sp2

  FROM (

    SELECT timestamp, CONVERT (xml, record) AS record 

    FROM sys.dm_os_ring_buffers 

    WHERE ring_buffer_type = 'RING_BUFFER_SCHEDULER_MONITOR'

      AND record LIKE '%<SystemHealth>%') AS t

) AS t

ORDER BY record_id desc

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