How to perform Memory Testing for live streaming?

Our dev team has implemented Live Streaming using AGORA(https://www.agora.io/en/) When more users join the stream (>20), RAM consumption increases in few user's machines and they see system messages like: "Your system is out of memory". Is there a way to perform RAM/Memory testing? P.S: I only know Selenium but if someone can let me know what to do I will learn