Wordpress and high load. How to optimize?

Question

Highload

There is a WordPress site. Costs on VDS.
Traffic comes from the news partner to the site. Peak
Can come up to 20,000 people in 5-7 minutes. Or maybe 9 thousand in 3 minutes. In general, traffic is unpredictable and high.
Can the site handle this kind of traffic?
What are the ways to optimize the server. Who can suggest a solution and / or help with solving this problem.
Server parameters
Intel® Core™ i7-4770 Quad-Core Haswell incl. Hyper-Threading Technology
RAM32 GB DDR3 RAM
Hard Drive2 x 2 TB SATA 6 Gb/s 7200 rpm HDD (Software-RAID 1)
Class Enterprise Connection 1 Gbit/s-Port
Guaranteed Bandwidth 200 Mbit/s
Issue resolved. a little later I will throw off the description of the actions

Answer 1

You can start with caching)

Answer 2

I wonder what answer you want to get here?
1. For a specific answer, diagnostics are required.
2. General recommendations for optimization are easy to find on the Internet.

Answer 3

Start by optimizing your site. Clean the theme of unnecessary plugins, speed up the site itself.

Answer 4

You also need to tune LAMP, install Nginx as a frontend, if not already.

Answer 5

As a rule, the weakest point is the DB .
Consider if its architecture is right; consider possible optimization options - sharding & replication. If your database does not support these functions, then you should think about moving to another storage.

Answer 6

Optimize the database
, set up full caching in some kind of warnish,
switch to the nginx + php-fpm
stack, you can see the performance of my vp on the example of my blog pumainthailand.com

Answer 7

https://wordpress.org/plugins/em-object-cache/
for the base itself, or W3 Total Cache