Alternate to STUFF and performance

We are using Stuff function which adds rows values as comma separated based on group by value.

Ex:

SELECT

(select stuff((select ','+convert(varchar(100),p.ReferenceNumber + '-' + p.EmpName + '-' + p.Status)

                           FROM [dbo].[tablename] P


                           WHERE P.PATENTID=DPD.patentid
                           order by p.ReferenceNumber
                           for xml path('')),1,1,'')
              ) AS PatentFamily
FROM tablename dpd 

Data in tablename as almost 15lakh, so we are facing lot of performance degradation. 

Any suggestions pls??

Thanks, Rajendra