INNER Join Takes High Cost

Below piece of code, INNER Join is used 2 times and its costing High on execution plan andtakes more than 2 min to complete.

is there a way to reduce the inner joins to speed up the store proc.. Please advice.

SET NOCOUNT ON

	declare @startInSysTime datetime, @endInSysTime datetime
	SELECT @startInSysTime=dbo.fnSiteTimeToSystemTime(@startDate), @endInSysTime=dbo.fnSiteTimeToSystemTime(@endDate)

	declare @userIDTable AS Table (Item int)
	INSERT INTO @userIDTable SELECT ContactUserID FROM ContactUser Where TeamID=@teamID

	declare @currentDateTime datetime
	set @currentDateTime=getDate()

	DECLARE @AuditDays Table(AuditDayID INT)
	INSERT INTO @AuditDays
	SELECT AuditDayID
	FROM AuditDay ad
	WHERE ad.Date >= @startInSysTime AND ad.Date < @endInSysTime

	declare @summary as Table (AgentID nvarchar(40), MessageType nvarchar(1), Answered int, [Out] int, OutCust int, Overflow int, Escalated int,
	AvgGradeOfService int, qaApproved int, goneIntoQA int, Transfered int)

	INSERT INTO @summary
	SELECT
		cu.UserID as 'Agent',
		cg.MessageType, 
		SUM(case when mat.AuditCodeName='Message Accepted' then 1 else 0 end) as 'Answered',
		SUM(case when mat.AuditCodeName='New Outbound Message' then 1 else 0 end) as 'Out',
		Count(distinct case when mat.AuditCodeName='New Outbound Message' then m.CustomerID else NULL end ) as 'OutCust', 
		SUM(case when mat.AuditCodeName='Message Escalated' then 1 else 0 end) as 'Overflow',
		SUM(case when mat.AuditCodeName='Message Escalated To Skill' then 1 else 0 end) as 'Escalated',
		AVG(ims.GradeOfService) AS 'AvgGradeOfService',
		SUM(case when (m.MessageDirection='o' and mat2.auditcodename='Message Not Edited') then 1 else 0 end) as 'qaApproved',	
		SUM(case when (m.MessageDirection='o' and mat2.auditcodename in('Message Deleted', 'Message Edited','Message Not Edited','Message Released')) then 1 else 0 end) as 'goneIntoQA',		
		SUM(case when mat3.AuditCodeName='Message.Transferred' then 1 else 0 end) as 'Transfered'
	FROM @userIDTable u
	inner join ContactUser cu on cu.ContactUserID=u.Item
	inner join MessageAuditTimes mat on (mat.ContactUserID=cu.ContactUserID	)
	inner join @AuditDays ad on ad.AuditDayID = mat.AuditDayID
	inner join AuditCode A on A.AuditCodeID = mat.auditcodeid AND A.auditcodename IN ('Message Accepted', 'Message Escalated', 'New Outbound Message', 'Message Escalated To Skill'	) 	
	inner join Message m on m.MessageID=mat.MessageID
	inner join ChannelConfig cg on cg.MessageType = m.MessageType
	left join MessageAuditTimes mat2 on (m.MessageID=mat2.MessageID AND mat2.auditcodename in('Message Deleted', 'Message Edited','Message Not Edited','Message Passed','Message Released'))
	left join MessageAuditTimes mat3 on (m.MessageID=mat3.MessageID AND mat3.auditcodename='Message.Transferred')
	left join InboundMessageStats ims on ims.MessageID = mat.MessageID 
	GROUP BY cu.UserID, cg.ChannelConfigID, cg.MessageType
	ORDER BY cu.UserID, cg.ChannelConfigID

	insert into @summary
	SELECT
		null, null,
		SUM(case when mat.AuditCodeName='Message Accepted' then 1 else 0 end) as 'Answered',
		SUM(case when mat.AuditCodeName='New Outbound Message' then 1 else 0 end) as 'Out',
		Count(distinct case when mat.AuditCodeName='New Outbound Message' then m.CustomerID else NULL end ) as 'OutCust', 
		SUM(case when mat.AuditCodeName='Message Escalated' then 1 else 0 end) as 'Overflow',
		SUM(case when mat.AuditCodeName='Message Escalated To Skill' then 1 else 0 end) as 'Escalated',
		AVG(ims.GradeOfService) AS 'AvgGradeOfService',
		SUM(case when (m.MessageDirection='o' and mat2.auditcodename='Message Not Edited') then 1 else 0 end) as 'qaApproved',	
		SUM(case when (m.MessageDirection='o' and mat2.auditcodename in('Message Deleted', 'Message Edited','Message Not Edited','Message Released')) then 1 else 0 end) as 'goneIntoQA',		
		SUM(case when mat3.AuditCodeName='Message.Transferred' then 1 else 0 end) as 'Transfered'
	FROM @userIDTable u
	inner join ContactUser cu on cu.ContactUserID=u.Item
	inner join MessageAuditTimes mat on (mat.ContactUserID=cu.ContactUserID	)
	inner join @AuditDays ad on ad.AuditDayID = mat.AuditDayID
	inner join AuditCode A on A.AuditCodeID = mat.auditcodeid AND A.auditcodename IN ('Message Accepted', 'Message Escalated', 'New Outbound Message', 'Message Escalated To Skill'	) 	
	inner join Message m on m.MessageID=mat.MessageID
	inner join ChannelConfig cg on cg.MessageType = m.MessageType
	left join MessageAuditTimes mat2 on (m.MessageID=mat2.MessageID AND mat2.auditcodename in('Message Deleted', 'Message Edited','Message Not Edited','Message Passed','Message Released'))
	left join MessageAuditTimes mat3 on (m.MessageID=mat3.MessageID AND mat3.auditcodename='Message.Transferred')
	left join InboundMessageStats ims on ims.MessageID = mat.MessageID 
	
	SELECT * FROM @summary
	
	SET NOCOUNT OFF

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