Query Performance Question

Hello. I have query performance question.
I need to optimize procedure

CREATE PROCEDURE dbo.SECUQUSRCOMPACCES
@P1 VARCHAR(50),
@P2 INTEGER
AS
DECLARE @IORGANIZATIONID INTEGER
EXECUTE dbo.ORGNQGETORGID @PORGUNIQUEID = @IORGANIZATIONID OUTPUT

SELECT TSECCOMP.ID,
CASE TSECPROFILEGRP.ACCESSTYPE
WHEN -1 THEN
CASE TSECCLASS.DEFAULTACCESS
WHEN -1 THEN
CASE TSECGROUPCOMP.DEFAULTACCESS
WHEN -1 THEN
TSECCOMP.DEFAULTACCESS
ELSE
TSECGROUPCOMP.DEFAULTACCESS
END

ELSE
TSECCLASS.DEFAULTACCESS
END
ELSE TSECPROFILEGRP.ACCESSTYPE
END AS EXPR1
FROM TSECCOMP
INNER JOIN ((TSECPROFILE
INNER JOIN (TSECCLASS
INNER JOIN TSECPROFILEGRP
ON TSECCLASS.UNIQUEID = TSECPROFILEGRP.SECURITYGROUPID)
ON TSECPROFILE.UNIQUEID = TSECPROFILEGRP.PROFILEID) INNER JOIN
TSECGROUPCOMP ON TSECCLASS.UNIQUEID = TSECGROUPCOMP.SECURITYGROUPID)
ON TSECCOMP.UNIQUEID = TSECGROUPCOMP.SECCOMPID
WHERE
(
CASE TSECPROFILEGRP.ACCESSTYPE
WHEN -1 THEN
CASE TSECCLASS.DEFAULTACCESS
WHEN -1 THEN
CASE TSECGROUPCOMP.DEFAULTACCESS
WHEN -1 THEN
TSECCOMP.DEFAULTACCESS
ELSE
TSECGROUPCOMP.DEFAULTACCESS
END
ELSE
TSECCLASS.DEFAULTACCESS
END
ELSE TSECPROFILEGRP.ACCESSTYPE
END > 0 ) AND (TSECPROFILE.KEYVALUE=@P1) AND ( TSECCOMP.TYPE =@P2)
AND TSECCOMP.ORGANIZATIONID = @IORGANIZATIONID
GO
Thank you In advance.