You cannot really 'change the resources' they use unless the tool itself has options for the number of threads/memory usage etc.

The only real changes you could make that might marginally speed something up would be to parallelise it with gnu parallel (if possible), or maybe change the niceness of the process.

As Dariober said, there are not really many options in 'default' tools to monitor resource usage other than at the overall system level once a script is running (e.g. free, htop/top and ps etc). You would have to look at installing some sort of server monitoring solution, but its probably not worth the effort. There are some tools here, but even they are not 'in-script' measures https://www.tecmint.com/command-line-tools-to-monitor-linux-performance/

You can 'profile' your commands by using time to figure out where the slow bits are, but unless your code is very inefficient you won't be able to do much to change it.