Performance Issue in Select groupby - sql

Question

I have following block of code and It takes approx 4-5 minutes to execute. All the tables in this block has large amount of data.
Select
spa.Student_Id,
Cast(Case When ISNULL(#PeriodNumbers, '') = '' Then --PeriodCode Come
CPS.PeriodIdentifier
Else --period number come
Cast(SPA.PeriodNumber as varchar)
End As varchar) As Period,
IsNULL(Count(*), 0) As TotalCount,
AC.ExcessiveAbsAttendanceType,
Cast(SPA.PeriodNumber as varchar) As PeriodNumber
From
(Select Student_ID
From OpenXml(#Handle,'/NewDataSet/Table', 2)
With (Student_ID int) As DT
) FilterDT
Inner Join
dbo.StudentPeriodicAttendanceArchive SPA WITH(NOLOCK) On FilterDT.Student_ID = SPA.Student_ID
Inner Join
dbo.AcademicYear AY WITH(NOLOCK) On AY.AYIdentifier = #AYIdentifier
And AY.School_Domain = #School_Domain
Inner join
dbo.CPsession CPS WITH(NOLOCK) On CPS.SSEC_ID = SPA.SSEC_ID
And CPS.PeriodNumber= spa.periodnumber
And CPS.School_Domain = #School_Domain
And CPS.AYIdentifier = #AYIdentifier
And (CPS.CPSDelStatus = 0 Or CPS.CPSDelStatus Is Null)
Inner Join
dbo.BellTimingScheduleStructure BTSS WITH(NOLOCK) ON BTSS.DayNumber = CPS.WD_ID
And BTSS.SchedulingWeek = CPS.Week
Inner Join
dbo.ClassPeriods CP WITH(NOLOCK) On CP.CP_Id = CPS.CP_ID
And BTSS.CPR_ID = CP.CPR_ID
And BTSS.WeekDay = Case When BTSS.CPRType='D' Then BTSS.WeekDay Else CP.WD_ID End
And BTSS.DayNumber = Case When BTSS.CPRType='D' Then CP.WD_ID Else BTSS.DayNumber End
And BTSS.SchedulingWeek = Case When BTSS.CPRType='W' Then BTSS.SchedulingWeek Else CP.Week End
And BTSS.DateItem = SPA.Attdate
And CP.CPDelStatus = '0'
And IsNull(CP.IsLocked, '0') = '0'
Inner Join
dbo.AttendanceCodes AC WITH(NOLOCK) On AC.AC_ID = SPA.AttCode_ID
Where
SPA.School_Domain = #School_Domain
And AttDate >= Case When #IsYearLongTotals=1 then AY.AYStartDate Else #ActualStartDate End
And AttDate <= Case When #IsYearLongTotals=1 then AY.AYEndDate Else #ActualEndDate End
And IsNull(#Subject_ID, -1) = Case When IsNull(#Subject_ID, -1) <> -1
Then CPS.Subject_ID
Else IsNull(#Subject_ID, -1)
End
Group By
spa.Student_ID,
Cast(Case When ISNULL(#PeriodNumbers, '') = ''
Then CPS.PeriodIdentifier
Else
Cast(SPA.PeriodNumber as varchar)
End As varchar), AC.ExcessiveAbsAttendanceType,
Cast(SPA.PeriodNumber as varchar)
I have a table StudentPeriodicAttendanceArchive which contains attendance information. I want to calculate total present and absent count.
Please suggest what should I do to improve the performance. I am using SQL Server 2008 R2