Chatgpt is heavier or is that a bug ?

hello devs, i was recently using chatgpt for a while and i got a surprise that when i try to open and start chats old chats which have a lot of conversations in it of course and suddenly my entire RAM was on the fire that my laptop started to freeze down. may be this is because chatgpt's DOM ,but they must optimize. Also switching chats is good option but it still misses topic and goes out of context, better if they provide a summary option which help keeping track of context. What do you think ?