An account that has been migrated to a Jagex Account cannot be reverted back to a RuneScape account - being able to do that would take away all security benefits provided by the upgrade. Eventually, all players will be required to use Jagex Accounts to access RuneScape and Old School RuneScape.
With that in mind, the Jagex Launcher is launching the same game clients you already had downloaded, so it shouldn't be making things slower. Once you have launched the game you could always go and exit it if you feel it is making a difference, as it is only needed to launch the game and is not needed after that.
31-Dec-2023 14:43:01