(Sorry, I missed this over the weekend) - I think the issue in this case is you're selling this as a guaranteed 3ms, going down from 4-7ms. If you have to pause for this 50ms GC once every X trades, then you force the GC to happen _after_ the X-1th trade has completed, but you need to provision an extra 15(?) machines to cover the pause. Otherwise, you're not delivering 3ms trades, you're delivering (3 + GCTime/X) ms. It doesn't matter if GC takes 1ms or 1s, you "simply" need to have the capacity to cover the extra GC time.