He's using Libbitcoin, it's an alt-implementation maintained since 2011.

https://github.com/libbitcoin

https://twitter.com/evoskuil/status/1784765202078056528

Here's the dev slack:

https://join.slack.com/t/libbitcoin/shared_invite/enQtNDgxMjQxODg0NTM1LTFhYzNhYjYxYTg1OTc0NGQ0OWQxY2ZiYWI5ODc1ZmFjZjEyNGZkNWQwM2JiMzk0YjhkMDc0MjkxOTgwMzQ0ZDM

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I haven't personally verified the performance, but the devs regularly share perf. results on the slack

I joined the Slack, but I don't get the numbers.

Have you seen this? https://blog.lopp.net/2023-bitcoin-node-performance-tests/

Hmm that doesn't seem right. Must be some bug or setup issue causing it to use disk instead of RAM for syncing.

Also Eric's figures are with 32x2 cores, 256gb ram, and 1gb connection