Memory Error with simple SUM measures

Hello,

Last week an user had an error on a report that only compares real turnover with budget.  My model has two different currencies, one in local currency and one in USD.  Both fact tables, sales and budget has two columns for each currency, so all I needed to do was create the measures as SUM(Sales LC) and SUM(Sales USD). Then, the user can choose wich currency need to see. For this I made a measure with a SWITCH statement

The problem is that the measure in USD takes until 3x times that the LC.  But it is just the column next to the other one!
I thought the problem was the SWICTH, but then I performed some tests in Dax Studio, only with the SUM measures and the behaviour is as I say, one SUM is much slower than the other
I also checked the datatypes and both are decimal

Regards