Why is ChatGPT so bad at being a "chat"?

I feel like the amount of messages that you can send in a single chat without the entire chat taking minutes to load are getting less and less. I swear I sent in an exam to explain some of the questions and solutions plus 3 or 4 follow up questions and that was already enough for the chat to start chugging a bit. How are you meant to work on large scale problems in chats that can't 10 full questions? Don't tell me to turn on memory between chats because that BARELY works and I'll have to correct ChatGPT after every answer because it's taking the wrong info.