DAX Optimization Help Needed - Measure That Calculates On Each Date Point in a Line Chart

Hi all,

I have a measure that calculates retention, and my goal is to plot retention over time. The measure works as intended, but when I plot it across more than a few date points, the chart loads pretty slowly. For example, I have a line chart displaying retention over the last 30 days, and it takes about 10 seconds to load.

The dimDate[Date] field is on the X-axis of the line chart, and this measure is on the Y-axis. The dimDate table is NOT connected to any other table via relationships, which allows the measure to function the way it does.

Are there ways I can optimize the performance of this measure or perhaps take a different approach to achieve the same result with faster performance?

Here is the measure:

DynamicRetentionRateDay =
VAR SelectedDate = MAX('dimDate'[Date])
VAR SelectedDateMinus367 = SelectedDate - 367
VAR CurrentMembers =
     CALCULATETABLE(
          DISTINCT('Invoice'[membership__c]),
          ALL('Invoice'),
          'Invoice'[CreatedDate] <= SelectedDate,
          'Invoice'[Expiration_Date__c] >= SelectedDate,
          'Invoice'[Membership_Type__c] <> "Trial Membership"
     )
VAR Members367DaysAgo =
     CALCULATETABLE(
          DISTINCT('Invoice'[membership__c]),
          'Invoice'[CreatedDate] <= SelectedDateMinus367,
          'Invoice'[Expiration_Date__c] >= SelectedDateMinus367
     )
VAR ActiveBoth = INTERSECT(CurrentMembers, Members367DaysAgo)
VAR CountActiveBoth = COUNTROWS(ActiveBoth)
VAR CountMembers367DaysAgo = COUNTROWS(Members367DaysAgo)
RETURN
     DIVIDE(CountActiveBoth, CountMembers367DaysAgo)