Hi,
My name is Chris and I am based in the United Kingdom, I speak native English.
I have over twenty years experience in managing servers for clients around the world. From simple small level VPS's to large multiple-instance setups at Amazon AWS. I also have built, configured and managed my own dedicated servers during this time!
I am an expert Linux server admin and would happily take a look at your server and pinpoint where the problem lies with regards to your slow TTFB.
Drop me a PM and let us discuss this project in a littler more detail - I am ready to get started on it when you are!
Kind regards,
Chris