did something change in the tester


did something change in the memory management (loaded structures user built across optimization passes) in custom max mode ,in build 3661

i'm getting gradually decelerating tests - with each pass - 


if its not a mem change , the code is using math functions heavily on the same data over and over again hence my worry -since the data is the same -

if its the "math cache" how can i drop it mid optimization ?