We are currently using Nxlog enterprise 4.0.3735 to send events logs(windows events - > json out) from windows server to central log server.

1. I want to estimate system requirements(cpu,memory,disk) needed by nxlog agent to handle 4000 to 5000 events per seconds. I m also concerned about what happens when the agent gets high (unexpected) number of events more than expected during peak load times
2. Are logs buffered some where on disk and sent later or something similar when link between the nxlog agent and central logserver is broken for some reason ?