More power...

amitchandak , thank you for your reply. Looking at the suggestion it looks like the idea behind the answer is different from what I've been looking for. My issue is not the problem when you run out of memory. I don't have this issue. I have plenty of memory in surplus and want to get this assigned to the report to improve the refresh time. 

Basically I have a containsstring on a large dataset which takes up most of the calculation time. I've managed to make it work because in the past the cached memory was enormous and killing the calculation. 

Can this be done, assigning surplus memory to a report?