Sql-server – How tomprove Performance of Query in SQL Server

I have a query and currently it's taking 10 seconds for only 324 records. Is there any way to improve this performance?

I have tried using SET NOCOUNT ON in the SP as I have read that it improves performance and even have used an alias for each table.

Execution Plan (Paste The Plan)

SET NOCOUNT ON  
 DECLARE @vRequestedBy VARCHAR(2000) = CASE WHEN @RequestedBy <> '' THEN @RequestedBy END,  
   @vJobType NVARCHAR(2000) = CASE WHEN @JobType <> '' THEN @JobType END;  


 SELECT  distinct ts.JobID,   
  TCC.Category,   
  ts.JobType,   
  ttj.JobStatus,   
  wc.Name "ContactName",   
  ts.Created,   
  wb.Name AS BuildingName,   
  --dbo.TSP_TSR_Job.JobStatusID,   
  --dbo.TSP_TSR_Job.BuildingID,   
  --dbo.TSP_TSR_Job.TenancyID,   
  --dbo.TSP_TSR_Job.CategoryID,   
  ts.Contact,   
 ts.CreatedBy,   
  ts.ContactEmail,   
  wc.TradingAs,  
  --wsm_Contact_User.UserId "RequestedByUserId",  
  c2.Name "RequestedByUser",  
  wc.ContactID  
  FROM   
   dbo.TSP_TSR_Job ts  
  LEFT OUTER JOIN   
   dbo.wsm_Ref_Buildings wb ON ts.BuildingID = wb.BuildingId   
  LEFT OUTER JOIN   
   dbo.wsm_Contact wc ON ts.TenancyID = wc.ContactID   
  LEFT OUTER JOIN   
   dbo.TSP_TSR_JobStatus TTJ ON ts.JobStatusID = TTJ.JobStatusID   
  LEFT OUTER JOIN   
   dbo.TSP_CAT_Category TCC ON ts.CategoryID = TCC.CategoryID  
  LEFT OUTER JOIN   
   dbo.wsm_Contact_User WCU ON UserID = ts.ContactEmail COLLATE SQL_Latin1_General_CP1_CI_AS  
  LEFT OUTER JOIN   
   dbo.wsm_Contact c2 ON c2.ContactID = WCU.ContactID  

  WHERE     
   -- JobId criteria  
    (@JobID = 0 OR JobID = @JobId)  
   -- Tenancy criteria   
   AND (@TenancyId = '0' OR TenancyId in (select Item from Split_fn(@TenancyID,',')))  
   --TradingAs criteria  
   AND (@TradingAs = '0' OR wc.ContactID in (select Item from Split_fn(@TradingAs,',') ))  
   --RequestedBy    
   AND (@vRequestedBy IS NULL OR @vRequestedBy = '0' OR ts.ContactEmail in (Select distinct Email from dbo.wsm_Contact WHere Email in (select Item from Split_fn(@vRequestedBy,',')) ))  
   -- Job Category  
   AND (@CategoryId = '0' OR ts.CategoryID in (select Item from Split_fn(@CategoryId,',') ))  
   -- Contact Id (always filter on this, enough security?!)    
   AND ts.BuildingID IN (SELECT distinct b.BuildingId    
            FROM   
             wsm_ContactSite s   
            INNER JOIN   
             wsm_Contact c ON c.ContactID = s.ContactID  
            INNER JOIN   
             wsm_Ref_Buildings b ON b.SiteId = s.SiteID  
            WHERE   
             c.ContactID = @ContactUserId)  

   AND wc.FloorID  IN     (SELECT t.FloorID   
              FROM wsm_Contact_Tenancy t  
             WHERE t.ContactID = @ContactUserId)  

   AND wc.OCCPSTAT NOT IN ('I', 'P')  

   AND (@vJobType IS NULL OR ts.JobType in (select Item from Split_fn(@vJobType,',')))  
   AND (ts.Created between @CreatedFrom and DATEADD(DD,1,@CreatedTo))  
   ORDER BY   
    JobID

STATS:

 SQL Server parse  SQL S and compile time: 
       CPU time = 0 ms, elapsed time = 0 ms.
    SQL Server parse and compile time: 
       CPU time = 0 ms, elapsed time = 0 ms.

     SQL Server Execution Times:
       CPU time = 0 ms,  elapsed time = 0 ms.

     SQL Server Execution Times:
       CPU time = 0 ms,  elapsed time = 0 ms.
    Table 'TSP_CAT_Category'. Scan count 1, logical reads 3, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'wsm_Contact_Tenancy'. Scan count 1, logical reads 3, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'wsm_Contact'. Scan count 2, logical reads 3822, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'wsm_ContactSite'. Scan count 1, logical reads 5, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'wsm_Ref_Buildings'. Scan count 3, logical reads 2811, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'Worktable'. Scan count 2, logical reads 341364, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table '#AFEC4F2F'. Scan count 2, logical reads 524444, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'TSP_TSR_Job'. Scan count 3, logical reads 58210, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'wsm_Contact_User'. Scan count 2, logical reads 2300, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'TSP_TSR_JobStatus'. Scan count 2, logical reads 650, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table '1159564537'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table '#BB5E01DB'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table '#BA69DDA2'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table '#B1D497A1'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
    Table '#B0E07368'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

     SQL Server Execution Times:
       CPU time = 8391 ms,  elapsed time = 5792 ms.

     SQL Server Execution Times:
       CPU time = 8391 ms,  elapsed time = 5793 ms.