This is Lana from Shopify Support. I can see you are having some issues with your admin so I wanted to help you out.
From what you're describing, it sounds like this issue could be related to the cache and cookies on your browser. Could you try to clear your cache on the Google Chrome browser following these steps here and see if that is an improvement?
If it does not help, please do tell me more about what you are seeing and include any screenshots if you can of examples to show where it freezes or does not let you save.
If you have any other questions here at all, do feel free to ask me here and I will be happy to help!