Little to high server response time

My website is foodtrucksenzo.nl. I use nuxt 3, supabase and netlify. When i run lighthouse, I get a warning about reducing initial server response time. It’s about 700-800 ms. See screenshot. Now this is a blackbox. I think i optimezed my website already pretty good. Also sometimes the first try is even slower. Like it misses the snappiees when loading. But this doesn’t happen all the time. So hard to capture. Any advice? Can this be supabase? And when it is really slow the server needs to wake up or something?

It is expected for the first request to be slower, consequitive requests should be faster:

I have a similar setup with nuxt3. How did you manage to solve this? My “waiting for server response” is multiple seconds and I just do not know to fix is or where to look at.