Hello Neha,
Were you able to solve your issue? My team and I are currently facing a similar situation and it would be very helpfull if you gave us your feedback on the solution, please?
Requisite: We are trying to create Web Intelligence reports on top of information hosted at BPC MS 10 level, how ever BPC MS XMLA connection does not retrieve any values, and w hen it does it takes long runtimes (sometimes throw s timeout error).
Thank you for your help 
Best regards,
Raquel Oliveira