Hello NDSAR,
We're glad you posted your question here in Apple Support Communities. It looks like you see the sharingd process in Activity Monitor and your Mac is running slower than expected. We're happy to help!
The sharingd process is a normal part of your macOS software. To double-check, are you seeing that it's using a significant amount of resources in Activity Monitor? The % CPU column is the best way to check: See how apps affect Mac performance, battery runtime, temperature and fan activity
This resource has some excellent steps that might help you: If your Mac runs slowly
We hope those steps help you. Feel free to reply back here with an update on the issue!
Kind regards.