Why getSession is slow

[meotimdihia]

It takes 200 ms for official examples. And the same as my website.
On first request, /api/auth/session even take ~2s to finish.
My website is deployed on Vercel.

Edit: I checked request https://next-auth-example.now.sh/api/auth/session traveled from sin1 -> sfo1 region: sin1::sfo1::4lz2w-1614827528416-43b17624ecbf
I think if I used JWT, the request can be verified directly on serverless function?

Edit2: It seems this is Vercel problem. I posted the question to Next.js discussion: vercel/next.js#22753