Why is my TTFB taking so long?

Hi, my server uses nginx and memcahed, the page loads for the first time very long, from the 2nd time is fine, i want to know if it is caused by nginx redirect or memcached, here is the link to test my website:
https://www.webpagetest.org/result/210831_AiDcHP_2429b91336201336119e2e7ed3169f61/

Your Time To First Byte took just over 2 whole minutes, I’m not actually even sure how this didn’t timeout. Either way, it seems your origin server is extremely slow
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thank you, there is indeed a problem with my theme