And while you're doing that, don't forget the effect of wrapping functions around columns in your WHERE clause (or joins)
WHERE S.LSKINdicator = 1
AND S.ProjectId IS NOT NULL
/*AP3-820 Check for BCWP > 0*/
AND S.ITD_BCWP_PMB > 0
AND (P.ProgramStatus = 1 OR PF.Spend <> 0)
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden