Generally yes to the first question, no to the second. If you want your code to have low perturbance on other concurrent work done by the system, implementing

Generally yes to the first question, no to the second. If you want your code to have low perturbance on other concurrent work done by the system, implementing it in a inefficient way doesn't usually help with that goal, since then your code will just be executing all the time because it takes a long time to finish. And you still won't have good control of the execution resources compared to using normal tools like OS scheduling policies to address the goal.