ESET Gateway Security - tuning performance

I'm trying ESET Gateway security on FreeBSD 7.2
esets_http works as upstream proxy for squid (redirects to esets_http only onnections to port 80, other ports - direct connections)
In ERA logs I see warnings
Could not connect to :80: could not connect destination
or
Cannot write to socket: Broken pipe
or
Cannot get source address - error in getaddrinfo

I think this is performance issues - I have up to 200 internet users
In configuration file esets.cfg i see

# Settings for ESETS HTTP filter module.

# agent_enabled = yes/no
# Enables/disables operation of the esets_http.
agent_enabled = yes

# num_proc = value
# Keep value processes of esets_http running in parallel.
#num_proc = 1

# num_thrd = value
# Keep value threads per process of esets_http running in parallel.
#num_thrd = 2


Which values are recomended by developers for 200-users gateway?

 

Error "Cannot get source address - error in getaddrinfo"
always appears, when user try to open nonexistent URL

2010-06-25 16:37:25
2010-06-25 16:31:33
HTTP filter
Cannot get source address - error in getaddrinfo

2010-06-25 16:37:25
2010-06-25 16:31:33
HTTP filter
Bad host or service: www.testtesttest123.com:80: hostname nor servname provided, or not known

I can ignore this error