I think nostr:npub1f5uuywemqwlejj2d7he6zjw8jz9wr0r5z6q8lhttxj333ph24cjsymjmug - san (Japanese dev) has already done some performance benchmark using various relays in #nostrasia hackaton.

nostr:npub1f5uuywemqwlejj2d7he6zjw8jz9wr0r5z6q8lhttxj333ph24cjsymjmug - san, where we can read your reports about relay performance? Is it in your github? Sorry, i may missing that 😅