My computer is also a bit bad, but I need the autosave feature.
In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.
it saves just like you would on console. Some games by design offer autosaving or forced save moments like sword shield pokemon for example. There are hundreds of games and they all save on yuzu fine.