Performance issue

while excuting my report it takes long time.

in sm51 it shows sequential read on mseg.what i have to do.this is how i am fetching data from mseg,

select mblnr

            mjahr

            zeile

            bwart

            matnr

            menge

            meins

            shkzg

            werks

            dmbtr

            kzstr

            ebeln

            bwtar

            xauto

            aufnr

       into corresponding fields of table git_mseg_h

       from mseg

       for all entries in git_mkpf_h

       where mblnr = git_mkpf_h-mblnr and

             mjahr = git_mkpf_h-mjahr and

             zeile in s_zeile.