Very slow performance; 500 errors via API

Hi, We are seeing very slow performance - both in API responses as well as trying to use the web UI. The API is also sporadically returning us 500 errors. We seem to get brief windows in which we can successfully get an API call through, but then the 500s start happening again. The system status page seems to indicate all is well, but that is not our experience. I'm trying to establish if this is something specific to our account, or are there system-wide issues? Thank you!