The new launcher slows down everything tremendously after going through the first time setup, then it sometimes pulls up the launcher and sometimes leaves the screen as it was before the setup finished, but always stops responding to all interactions after this. All older launchers simply slow down everything tremendously and then stop responding to any interactions after pulling up the main launcher page. This has prevented me from playing the game on this computer only, but I can still manage to play the game from the website with the web applet. I have already cleared my .minecraft folder, have reinstalled the latest version of Java, have run from a new computer profile, have removed my computer's antivirus, and have restarted my computer with no affect.