As soon as possible i will run a memory usage profiler in my application and report back. In the meanwhile, thanks a lot for the very useful suggestions and links to things i was not aware of yet ( the RunGraphs function) .
At the moment i cannot really rearrange the code so that i bookkep all operations for RDataFrames first.
Just wondering if :
Define<Double_t>("newCol","MathExpression") , instead of Define( "...");
would be already improving things or it’s uselss and the real fix would be to repack “MathExpression” into some lamdba function