I'm need to make several hundred "Get Contact" calls. To get around the batch limit, nominally 25 calls per second, I break the calls into batches of 25 and assure that no more than one batch is sent per second. I still get errors (HTTP 403 Forbidden, "Developer over Qps") and an auto-generated email stating that I exceeded the call limit and was throttled. I dropped the batch size to 24 and got the same result.
So what's the real limit? I don't want to slow the app down more than is necessary.