CPU usage increases when serving request

[plmanik]

Hi,
I'm seeing increase in CPU usage after getting request and it's coming down after returning response
During request processing Server.lua is taking more than 50% of cpu
How we can reduce cpu usage and debug this issue?
If we get parallel request(More than 5 request) CPU usage increases.
Is it normal for CPU to increase more than 50% during request processing?
Do we have any benchmarking details for CPU, memory usage?

Thanks,
Mani