WordPress Expert for Performance Optimization and MySQL Fix

Description

I am seeking a WordPress expert to Fix MySQL Out of Memory and Optimize WP Performance

1) MySQL Out of Memory
I am running WordPress Blog on a Linode Server. Recently, I’ve had MySQL Out of Memory issue when the site is on high traffic (200+ users online at the same time) and seems like it happened more frequent whenever we were publishing a new post.

You are responsible to investigate what is consuming the RAM and reconfigure the service to prevent this from happening in the future.

2) Optimize WP Performance
You are also responsible to optimize the WP for faster performance. I am currently using W3TC. For those cached pages, it load almost instantly, but for non-cached pages, such as categories pages and back-end dashboard, sometime it takes up to 6-9 seconds to get the first byte.

I need a expert to investigate the problem and optimize our site including the front end and back end to load under 1 second.

The candidate must:

Be excellent with WordPress and Linode (Linux Server) configuration

Be experienced in optimization of WordPress site.

Fix the MySQL Out of Memory Issue ASAP