Slow Time to First Byte,

[zpinhead]

Our new Wordpress crashed on the high-traffic 4th of July weekend. After a week of developer-side optimization, it occasionally bogs down, but things have improved, at least from the user perspective.

Time to first byte, however, remains an "F". A blank page get an A. Sometimes the DNS is slow.

http://www.webpagetest.org/result/150713...1/details/ BAD TEST
http://www.webpagetest.org/result/150713...1/details/ RELATIVELY GOOD
http://www.webpagetest.org/result/150714...1/details/ SLOW DNS

The host is a local company that handled similar traffic on an older Coldfusion site without. It's the only site on the server. I don't know the specs except for it's a new box with 4GB RAM.

- Is the server is under-resourced for the traffic (125,000 visits in July)?
- Do we have an application problem?
- Is that just the way it is for a resource-intensive site?

Thanks.