Hi Narges Takhtkeshha ! A good way to start with up to 10 million points is Matplotlib. You have a detailed article below to achieve plotting in 12 lines of code. Else I recommend pptk for bigger datasets.
I'm late to the party, but check out pptk. It's new but I've found to be quite performant at > 10M points. I've yet to have a "slow" cloud render issue
Salut j'ai un probleme dans l'utilisation de pyntcloud.plot() est que dans spyder n'affiche aucun graphe il me donne erreur ' use panel is no useful for show'