Choose either SELECTEDVALUE or force value Performance Issues

Anonymous , I have use this code in the past and it worked fast

Switch Period =
var _max1 = if(isfiltered('Date'),MAX( 'Date'[Date]) , today())

var _max = if(SELECTEDVALUE(Period[PeriodType],"MTD") = "Yesterday",MAX( 'Date'[Date])-1 , today()-1)
var _min =
SWITCH(SELECTEDVALUE(Period[PeriodType],"MTD"),
"YTD",eomonth(_max,-1*MONTH(_max))+1 , //FY April -March
"FYTD",if( Month(_max) <4 , date(year(_max)-1,4,1) ,date(year(_max),4,1)), //FY April -March
"QTD",eomonth(_max,-1* if( mod(Month(_max),3) =0,3,Month(_max)))+1,
"MTD",eomonth(_max,-1)+1 ,
"WTD", _max -WEEKDAY(_max,2)+1,
"today", today() ,
"Yesterday", today()-1 ,
"Cumm", Minx(ALLSELECTED('Date'),'Date'[Date]),
"Rolling 3", date(Year(_max), month(_max) -3, Day(_max))+1,
"Rolling 6", date(Year(_max), month(_max) -6, Day(_max))+1,
"Rolling 12", date(Year(_max), month(_max) -12, Day(_max))+1,
BLANK())
return
CALCULATE([net] ,DATESBETWEEN('Date'[Date],_min,_max))

Try if these can help

Switch Period =
var _max1 = if(isfiltered('Date'),MAX( 'Date'[Date]) , today())
var _max =
SWITCH(SELECTEDVALUE(Period[PeriodType],"MTD"),
"YTD",_max1,
"FYTD",_max1,
"QTD",_max1,
"MTD",_max1,
"This Month",eomonth(_max,0),
"LMTD",date(Year(_max), month(_max) -1, Day(_max)),
"Last Month",eomonth(_max,-1),
"WTD", _max1,
"Cumm",_max1,
"Rolling 3", _max1,
"Rolling 6", _max1,
"Rolling 12",_max1,
"Rolling 7 Day",_max1,
"Yesterday",_max1-1,
BLANK())

var _min =
SWITCH(SELECTEDVALUE(Period[PeriodType],"MTD"),
"YTD",eomonth(_max,-1*MONTH(_max))+1 , //FY April -March
"FYTD",if( Month(_max) <4 , date(year(_max)-1,4,1) ,date(year(_max),4,1)), //FY April -March
"QTD",eomonth(_max,-1* if( mod(Month(_max),3) =0,3,mod(Month(_max),3)))+1,
"MTD",eomonth(_max,-1)+1 ,
"This Month",eomonth(_max,-1)+1 ,
"LMTD",eomonth(_max,-1)+1,
"Last Month",eomonth(_max,-1)+1,
"WTD", _max -WEEKDAY(_max,2)+1,
"Cumm", Minx(ALLSELECTED('Date'),'Date'[Date]),
"Rolling 3", date(Year(_max), month(_max) -3, Day(_max))+1,
"Rolling 6", date(Year(_max), month(_max) -6, Day(_max))+1,
"Rolling 12", date(Year(_max), month(_max) -12, Day(_max))+1,
"Rolling 7 Day", date(Year(_max), month(_max) , Day(_max)-7),
"Yesterday",_max1-1
BLANK())
return
CALCULATE([net] ,DATESBETWEEN('Date'[Date],_min,_max))

Switch Period =
var _max = if(isfiltered('Date'),MAX( 'Date'[Date]) , today())
var _min =
SWITCH(SELECTEDVALUE(Period[PeriodType],"MTD"),
"YTD",eomonth(_max,-1*MONTH(_max))+1 , //FY April -March
"LYTD",eomonth(_max,-1*MONTH(_max))+1 ,
"FYTD",if( Month(_max) <4 , date(year(_max)-1,4,1) ,date(year(_max),4,1)), //FY April -March
"QTD",eomonth(_max,-1* if( mod(Month(_max),3) =0,3,Month(_max)))+1,
"MTD",eomonth(_max,-1)+1 ,
"LMTD",eomonth(_max,-1)+1 ,
"LYMTD",eomonth(_max,-1)+1 ,
"WTD", _max -WEEKDAY(_max,2)+1,
"Cumm", Minx(ALLSELECTED('Date'),'Date'[Date]),
"Rolling 3", date(Year(_max), month(_max) -3, Day(_max))+1,
"Rolling 6", date(Year(_max), month(_max) -6, Day(_max))+1,
"Rolling 12", date(Year(_max), month(_max) -12, Day(_max))+1,
BLANK())
var _max1 = SWITCH(SELECTEDVALUE(Period[PeriodType],"MTD") ,
"LYTD",Date(Year(_max)-1, month(_max), Day(_max))
"LMTD",Date(Year(_max), month(_max)-1, Day(_max))
"LYMTD",Date(Year(_max)-1, month(_max), Day(_max) ) ,
_max)
var _min1 = SWITCH(SELECTEDVALUE(Period[PeriodType],"MTD") ,
"LYTD",Date(Year(_min)-1, month(_min), Day(_min))
"LMTD",Date(Year(_min), month(_min)-1, Day(_min))
"LYMTD",Date(Year(_min)-1, month(_min), Day(_min) ) ,
_min)
return
CALCULATE([net] ,DATESBETWEEN('Date'[Date],_min1,_max1))

https://medium.com/chandakamit/power-bi-when-i-felt-lazy-and-i-needed-too-many-measures-ed8de20d9f79