PG Logging is Slow

Under postgres 7.3 logging is incredibly slow!

I have applied the following settings:

syslog = 2
syslog_facility = 'LOCAL0'
syslog_ident = 'postgres'

log_connections = true
log_duration = true
log_pid = true
log_statement = true
log_timestamp = true

This severely impacted the performance of our production system, a search
page which took 1-3 seconds now takes over 30, is this normal?

I need to get some performance indicators from our production db, however I
cant turn on logging with such performance degradation.

Theo

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