Before we get started with the steps, first try and reinstall Minecraft to ensure there are no corrupt files causing issues. Make sure you save your worlds properly so you don't lose any progress.

Make sure your JAVA client matches your operating system (32 or 64bit) and re-install respective version of JAVA client. 2# Minecraft – Low Performance, Low FPS ...

Some Minecraft users see an error message saying Connection Lost, Internal Exception: java.io.IOException, An existing connection was forcibly closed by the remote ...