Hey Marving! Thanks for sharing that code. Before checking it out I spoke with my colleague @angeloashmore and he let me know that you're currently checking to see if Sentry is the cause of the performance issues.
If that’s not it, could you give us a minimal reproducible example so that we can try it on our end?
From the code you posted and sent to Angelo you don’t seem to be doing anything wrong with your Prismic setup.
Let me know how it goes!