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.
I am in no way an expert on this but as Yuzu is a young emulator you are bound to have lag no matter what you have that said when Yuzu gets more updates your system won’t have a problem also make sure you use an Nvidia supported renderer, also side note when it comes to emulator GPU matter very little its the CPUs single core clock speed that counts most