Deep queries aren't usually a problem as it's usually just waiting on I/O, it's wide queries that are a bigger concern. I just remember that CPU load was very l

Deep queries aren't usually a problem as it's usually just waiting on I/O, it's wide queries that are a bigger concern. I just remember that CPU load was very low compared to other metrics, so I mostly focused on fixing memory (which was related to the file descriptor issue) usage. One issue I see a lot of (which happens to be part of the problem in this case) is people overfetching data on their list UI (e.g. search results) so that the detail page data is already in the client side store. But this is usually a premature optimisation and ends up causing more problems than it solves.