Does enabling new relic affect page load times and website performance?

We aren’t sure but our node app definitely performed better without New Relic.

Now we have not seen New Relic.’s source code but coming to think about it …New Relic. is writing to log every second and they are either posting data to their site or reading from the log.

Every operation even though async affects the site performance. so it makes sense..  What do you think?