Freezes at login, freezes at teleport, freezes when running anywhere in game.
These things started with the update of October 17, making it really had to play the game effectively.
Many people encountered similar problems, others don't and blame our "potato pc", it was fine until that specific update though, this is not on "us".
Mobile actually works better than my pc at the moment, it's ridiculous.
I read your post before you deleted it.
When you upgrade into a Jagex Account, you set a new login.
Make sure you are using the new login as your old logins won't work any longer.