600000 DBL data points should be peanuts for LabVIEW, I can create array 10x that size without problems (and I have less memory).
🙂It seems you are making way too many data copies. Can you post your code, I'm sure it can be streamlined. Are you using local variables?
Can you set it to e.g. only 60000 (10x less) points for testing, and if it runs, show the memory usage in VI properties (especially the DATA portion).