For those applications, I make such observations even when plenty of RAM is available and hence can be sure that no swapping is happening / causing such behaviour.
GIGAWARE USB TO ETHERNET SLOW SOFTWARE
Nevertheless, I have several few applications with similar outdated software design. I don't have such an adapter and rely on WiFi for those devices without builtin ethernet NIC. For the latter case, this would be a an outdated software design relevant for a specific usage pattern only and should not effect other use cases of the same ERP system. For the first case, it should not have such significant effects. I didn't get if your observation refers to a standard ERP client or to a special application for a single use case of an ERP system. Can't tell if several microseconds qualify already as more than small.