The single MOST important component in any PC used for gaming is the GPU. Never forget that. If you have a low end card, all manner of anomalous misbehavior symptoms from games are anticipated to continue.
Right from the start, the "minimum" hardware is not supposed to provide a particularly rewarding gaming experience, because the graphics must be sey to LOW, the screen resolution to Medium, and some occasional slowdowns should be expected.
Typically, if the gap from what you have to what you need is a small one, you coarsen your screen resolution, lower graphics to as absolutely low as it goes, and accept more slowing down here and there, but if it's a large discrepancy, that's not going to be enough.