Anyone knows about Rule Manager limitations in SD 4.5. It seems that if a lot of new items (via data exchange) are created in a short interval, the rule manager can not follow with executing the rules and drop some requests.
Although the load of the server is at a reasonable level.
Yes - it is quite possible to overload the Rule Manager. This was one of the first "performance" issues I encountered with HPSD - we first had to ensure that Data Exchanges were going through a dedicated App. Server and subsequently it was the thing which drove us to run two App. Server instances on each box - the boxes had loads of spare memory and processor (duals) but a single "rule manager thread" couldn't cope.