Need Performance Improvement Suggestions

Hi All,

Thank you for your suggestions. johnt75 My model doesnt follow the standard date calendar, hence i cant use any of the time intelligence functions.

I have rewritten my DAX again - now i am getting results within less than 30 seconds, here is my new code.

Top N Display = 

VAR vTopN = selectedvalue('Top'[TopN])

VAR vPremium = [Current Year Premium]

VAR vRank = 
IF( NOT ISBLANK(vPremium), Rankx(All Selected(customers[Customer Name]), 
Calculate( [Current Year Premium], 
AllSelected(Date),
All(Policy),
AllSelected('Calculation Type'),
AllSelected('Customer Group')
), , Desc, Dense))

Return
if (vRank<=vTopN, vPremium)

Thanks everyone for your suggestions. I was unable to share the PBIX since my model was using live connection to a dataset.