DAX Improvement

I was just preparing a few measures that'll be hitting against million of records, thus taking a lot of time. I have two DAX formula's that I've written in measures in SSAS (Tabular). All I seek here is to improve the performance of these two formula so that I can even save a few mili seconds on each, thus saving a lot of time over all.

1) IF (

    HASONEVALUE ( 'TableName'[QL] ) & SUM ( 'TableName'[Count] ) >= 20,

    CALCULATE (ROUND (DIVIDE (SUM ( 'TableName'[WS]), SUM ( 'TableName'[WB] )),2)* 100 + 100,

    'TableName'[TS] = "ABC" ),

    BLANK ()

        )

2) CALCULATE(DISTINCTCOUNT('TableName'[RS]), 'TableName'[WB] > 0)

The goal is to use as little as possible from the Formula Engine and rely more on the Storage Engine, or so the best practices say.

Thanks,

Harshey