Improve DAX Measure Performance - powerbi

Question

in my data set I have a performance issue. I want to speed up my measure and using DAX Studio I made some queries. If anyone has better way to write this measure I will be thankful. "ms" means milliseconds. Both filters are measures.
Original measure:
--original measure - 417 ms
define measure 'BI Booking'[WCX VRS Deals] =
CALCULATE([# Opportunities Booking],
FILTER('Shared Dim Opportunity',([Ent GTMs]="Americas" && [WCX VRS Amount]>=75000) || [Ent GTMs]<>"Americas" && [WCX VRS Amount]>=50000)
)
EVALUATE {[WCX VRS Deals]}
option 1 - using var filter table before the calculation
//option 1 - 358 ms
DEFINE
MEASURE 'BI Booking'[WCX VRS Deals] =
VAR _tbl =
FILTER (
'Shared Dim Opportunity',
( [Ent GTMs] = "Americas"
&& [CXOne VRS Amount] > 75000 )
|| ( [Ent GTMs] <> "Americas"
&& [CXOne VRS Amount] > 50000 )
)
RETURN
CALCULATE (
[# Opportunities Booking],
_tbl
)
EVALUATE
{[WCX VRS Deals]}
option 2 - using 2 tables and union
//option 2 - 505 ms
DEFINE
MEASURE 'BI Booking'[WCX VRS Deals] =
VAR _tbl_1 =
FILTER (
'Shared Dim Opportunity',
( [Ent GTMs] = "Americas" )
&& [CXOne VRS Amount] > 75000
)
VAR _tbl_2 =
FILTER (
'Shared Dim Opportunity',
( NOT ( [Ent GTMs] = "Americas" )
&& [CXOne VRS Amount] > 50000 )
)
VAR _full_tbl =
UNION (
_tbl_1,
_tbl_2
)
RETURN
CALCULATE (
[# Opportunities Booking],
_full_tbl
)
EVALUATE
{[WCX VRS Deals]}
option 3 - using CALCULATETABLE
//option 3 - 379 ms
DEFINE
MEASURE 'BI Booking'[CXOne VRS Deals] =
VAR _tbl =
CALCULATETABLE (
'Shared Dim Opportunity',
FILTER (
'Shared Dim Opportunity',
( [CXOne GTMs] = "Americas"
&& [CXOne VRS Amount] > 75000 )
|| ( [CXOne GTMs] <> "Americas"
&& [CXOne VRS Amount] > 50000 )
)
)
RETURN
CALCULATE (
'BI Booking'[# Opportunities Booking],
_tbl
)
EVALUATE
{[CXOne VRS Deals]}