Log replay can have at most 5 concurrent requests and thus doesn't load test!

[dsharkey]

From http://engineering.linkedin.com/nodejs/blazing-fast-nodejs-10-performance-tips-linkedin-mobile

The Node.js http client automatically uses socket pooling: by default, this limits you to 5 sockets per host. While the socket reuse may keep resource growth under control, it will be a serious bottleneck if you need to handle many concurrent requests that all need data from the same host. In these scenarios, it's a good idea to increase maxSockets or entirely disable socket pooling: