Performance issue in select and loop

I need to adjust the performance of my code, the execution like it is now takes very long to run.

The "bw_table"  contains around 7 fields and 40'000 posts.

And the "result_package" contains 60 fields and appr 2'000'000 posts

Is there any better ways to adjust this code below?

SELECT * FROM bw_table

INTO TABLE it_bw_table

FOR ALL ENTRIES IN Result_package

WHERE cond1 = cond2

LOOP AT Result_package ASSIGNING <result>

LOOP AT it_bw_table INTO ls_bw_table

WHERE cond1 = <result>-cond1

AND cond2 = <result>-cond2

AND cond3 = <result>-cond3

IF statement

ELSEIF statement

ENDIF

ENDLOOP

ENDLOOP