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Perfromance Issue with the Query...

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Hi everyone,I have written one sql which is having performance problem.This table is partitioned on EVENTDATE column and having 10 crs records in it.The block of qry which slow down I am posting here. In short what I did in that block isI have one temporary table where I collected sub result so that I can use it for further data fetch.I am possessing 15000 records from that temporary table each time as this help me in performance with compare to situation when I processed all temp table in one shotwhen this temporary table having 100000 records performance is ~6 mins that hv to reduce.declare @ROWPROCESSED int SELECT @ROWPROCESSED = 0 while (@ROWPROCESSED <= (select MAX(ROWNO) from #temp)) begin insert into #temp2(QUANSTOCKNKG, QUANCONDNKG, EVENTDATE)select T1.QUANSTOCKNKG as QUANSTOCKNKG , T1.QUANCONDNKG as QUANCONDNKG, T1.EVENTDATE as EVENTDATE from( [i][b]SELECT O.QUANSTOCKNKG as QUANSTOCKNKG , O.QUANCONDNKG as QUANCONDNKG, O.EVENTDATE as EVENTDATE from ORDERSTOCKFACTS O --#temp T--join ORDERSTOCKFACTS O on O.MILLORDNO = T.MILLORDNO and O.MACHCHAINNO = T.MACHCHAINNO and O.ORDERLINENO = T.ORDERLINENO where exists(select 1 from #temp T where O.MILLORDNO = T.MILLORDNO and O.MACHCHAINNO = T.MACHCHAINNO and O.ORDERLINENO = T.ORDERLINENO and T.ROWNO > @ROWPROCESSED and T.ROWNO < @ROWPROCESSED + 15001)and O.EVENTDATE >= convert(smalldatetime,'01-12-2011',105) and O.EVENTDATE <= convert(smalldatetime,'01-5-2015',105) and O.QUALITYCODE = 'P' AND O.INVSTATUS = 'UN' AND O.READINESS = 'F' --and T.ROWNO > @ROWPROCESSED and T.ROWNO < @ROWPROCESSED + 15001[/b][/i])T1 select @ROWPROCESSED = @ROWPROCESSED + 15000 endThe middle block is the query which is actually time consuming. Can anybody suggest what can I do to get ride on this performance issue.table definition and index I have attached. find attachment for execution plan also...Please suggest if you feel what we could have to improve the performance Many thanks.

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