The OS will handle priority in most cases. As you do not seem to be a power user, I'm not even going bring up some of the things that linux can do with the
nice command or worry you about a real time operating system, but I will try to give you some basic ideas of where things like audio "stutter" can come from.
Your computer needs to take data from the RTL source (be it the actual dongle plugged into your USB port, or via network & RTL_TCP or what have you. The program you are trying to use will need to interact with the data, and how it does that will be handled by the OS you have. The data will need to go from the USB host to (usually) some sort of memory, usually get moved to a processor cache --> get processed by the CPU --> (usually) back into memory as a result --> displayed, stored, manipulated, etc for output. Depending on what type of hardware you have, you might have
massive bottlenecks in particular subsystems along the way that essentially cripple a pathway or pipeline that your request is trying to hammer data down (...here's looking at you early Raspberry Pis). Those bottlenecks mean that data isn't moved as fast as expected, and down stream processing (audio) doesn't get the nice smooth flow of data it needs to get you a good solid audio stream..and you get stutters. Or, you could have insufficient memory available for a tasks requirements, and the OS has to page that memory to disk in a Virtual Memory situation and that takes a relative eternity when compared to on-die RAM activity...and you get stutters. You could also have a multitude of devices sharing a
hardware interrupt, and activity on one piece of hardware can pull the attention away from something not important (like audio output) and bang...audio stuttering. You see where this is going? There's a lot more.
If you're not really computer saavy, I guess I would say try a couple of basic SDR suites out and see what fits. I don't know what your usecase is, what you use your computer for, or what your complete hardware specs are, but I can say try and see. Trying to reprioritize program importance is not something that I would advise someone who tells everyone that they "are not computer saavy" should ever try.
See what you can do with what's in front of you.
