This is a code sample to measure execution time of code fragment:

        long start = System.currentTimeMillis();
        // do the work
        long end = System.currentTimeMillis();
        console.getOut().println("execution time:"+ (end - start));

In general, operations with history and indicators tend to require more time than the others. Therefore, they could be optimized first.
Also, for performance it is better to do heavy work in onBar() method rather than onTick().

Thanks

I already put it on test .. and here is what I got from the strategy report
so what should I do ?

INFO
13.02.2017 10:46:34 Stopping "Test" strategy at 2017-02-13 10:46:34.299 GMT on the remote server
INFO
13.02.2017 10:46:33 Strategy is going to be stopped - Process already marked as terminated
INFO
13.02.2017 10:38:59 Strategy is going to be stopped - Out of memory

So .. ??