I want to know how to let the Netflow Analyzer uses more memory, to get more better performance

I want to know how to let the Netflow Analyzer uses more memory, to get more better performance

I have a Server with 64 GB Memory,but,I can only find the performance turning topic,that used the maximum memory is 16 GB. So, how do I change the parameters to use more memory,to get to more better performance? Any one help me? Thanks.