> Probably the worst I've seen are threaded web frameworks used for making external API calls (to facebook, say). You can a machine doing 0 CPU and Disk, but co

> Probably the worst I've seen are threaded web frameworks used for making external API calls (to facebook, say). You can a machine doing 0 CPU and Disk, but completely locking up. Or the intranet equivalent: LDAP group resolution for a user. So slow ... so incredibly slow. I've never seen an application which cannot be (massively) speed up by caching this information after retrieving it the first time.