DAX Engine Changes in Power BI Desktop October 2024 Update?

Hi KNP ,
Thank you for your support. I just tried to reproduce this behaviour on a machine with the old Power BI Dektop version. Maybe I did a change in my code the caused my obersvation, not the update that I did at about the same time.
This code still translates into a query using callbacks:

DEFINE 

---- MODEL MEASURES BEGIN ----
MEASURE FactOnlineSales[Large Sales LC] = SUMX (
    'FactOnlineSales',
    IF ('FactOnlineSales'[SalesAmount] >= 50, 'FactOnlineSales'[SalesAmount] )
)
---- MODEL MEASURES END ----

 EVALUATE
 SUMMARIZECOLUMNS (
 	'DimDate'[CalendarYear],
 	"Large Sales LC", [Large Sales LC]
 )

Whereas this code does not translate into a query using callbacks:

DEFINE 

---- MODEL MEASURES BEGIN ----
MEASURE FactOnlineSales[Sales LC] = SUM ( 'FactOnlineSales'[SalesAmount] )

MEASURE FactOnlineSales[Large Sales LC] = SUMX (
    'FactOnlineSales',
    VAR _Sales = [Sales LC] RETURN IF ( _Sales >= 50, _Sales )
)
---- MODEL MEASURES END ----

 EVALUATE
 SUMMARIZECOLUMNS (
 	'DimDate'[CalendarYear],
 	"Large Sales LC", [Large Sales LC]
 )

Interesting: The callback solution runs 167 ms, the non-callback solution ran 24894 ms. Optimized code ran 40ms. So you can mess up even further by getting rid of the callback solution 😀

Kind regards,
Martin