Some users may observe that the Parsec interface is extremely slow in all scenarios, such as when you've not yet joined a device, and when you move the Parsec window around your desktop. Possible reasons include:

• There is a conflict with applications like DisplayFusion and Stardock Groupy. Try closing these applications temporarily and confirm the issue
  • The issue with DisplayFusion may stop happening if DisplayFusion Settings > Alt+Tab > 'Show on primary monitor only, show all windows' is disabled
• You are running Parsec on an ARM64 device, and Parsec is outdated and failing to update itself to the latest version. Reinstall the application if this seems to be the case