SQL Server Performance issues || SQL Server Long Running Query || SQL Server Query Running Slow

SQL Server Performance issues || SQL Server Long Running Query || SQL Server Query Running Slow
Query:-
SELECT s.session_id
,r.STATUS
,r.blocking_session_id 'blocked by'
,r.wait_type
,wait_resource
,r.wait_time / (1000.0) 'Wait Time (in Sec)'
,r.cpu_time
,r.logical_reads
,r.reads
,r.writes
,r.total_elapsed_time / (1000.0) 'Elapsed Time (in Sec)'
,Substring(st.TEXT, (r.statement_start_offset / 2) + 1, (
(
CASE r.statement_end_offset
WHEN - 1
THEN Datalength(st.TEXT)
ELSE r.statement_end_offset
END - r.statement_start_offset
) / 2
) + 1) AS statement_text
,Coalesce(Quotename(Db_name(st.dbid)) + N'.' + Quotename(Object_schema_name(st.objectid, st.dbid)) + N'.' +
Quotename(Object_name(st.objectid, st.dbid)), '') AS command_text
,r.command
,s.login_name
,s.host_name
,s.program_name
,s.host_process_id
,s.last_request_end_time
,s.login_time
,r.open_transaction_count
FROM sys.dm_exec_sessions AS s
INNER JOIN sys.dm_exec_requests AS r ON r.session_id = s.session_id
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS st
WHERE r.session_id != @@SPID
ORDER BY r.cpu_time DESC
,r.STATUS
,r.blocking_session_id
,s.session_id

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