As of 2025-03-23, the ISFDB server continues to experience major performance issues due to continuous bot attacks. We are working on mitigating them, but it's still very much a work in progress. We'll post another update when we know more.
2025-03-24 edit: Disabling anonymous access to the ISFDB Wiki seems to have stopped the bad bots, at least for now. We will continue monitoring the situation.