Optimize wordpress site

nguyenvanhieu

Hi all, i have a wordpress blog site seem not optimal. When i have above 70 user online (Google Analytics realtime), sometime my site got error connect to databases, sometime 520 error (I am using Cloudflare), CPU and RAM are full when it happend.

The image bellow show the test 250 clients over 1 min using loader.io and the test did not complete. Any suggestion to improve the performance for this site?

My site info:

SiteUrl: http://nguyenvanhieu.vn/
Wordpress version: 5.5.1 (latest)
VPS: Vultr, 10$/month (2GB Ram, 55GB SSD, 1vCPU)
Wordpress theme: Newspaper 10.3 (latest)
Currently my site have 411 posts, 3 pages

I install my site using WordOps:

Version: v3.12.2 (latest)
PHP: 7.4.3
Nginx: 1.16.1
Redis cache: wo site create site.tld --wp --wpredis

The Newspaper theme tell me should use WP super cache, so i also using this plugin for caching (follow Newspaper setting instruction). I also using Autoptimize for combine CSS, JS to reduce number of requests.

List 21 use plugin:

Akismet Anti-Spam
AMP
Autoptimize
Contact Form 7
Crayon Syntax Highlighter
Easy Affiliate Links
Easy Table of Contents
Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue
Nginx Helper
Organize Series
Rank Math SEO
Really Simple SSL
Smush
tagDiv Cloud Library
tagDiv Composer
tagDiv Mobile Theme
tagDiv Standard Pack
TinyMCE Advanced
WP Search with Algolia
WP Super Cache
wpDiscuz

nsgoyat

Remove WP Super Cache.
Update your site to use FastCGI Cache: wo site update nguyenvanhieu.vn --wpfc

Retest the site and let me know if you see any improvement.

nguyenvanhieu

nsgoyat Update your site to use FastCGI Cache: wo site update nguyenvanhieu.vn --wpfc

Can you write some explain why do that?
I did that before, it seem --wpredis better than --wpfc.
Right after switch to --wpfc, my site is full CPU & RAM (about more than 60 user online currently). So i switch back and it's ok.

nsgoyat

nguyenvanhieu I recommended it because in general, Server Level Cache is expected to provide you with better performance compared to a plugin-based cache. If WP Super Cache performs better in your case then also make sure you use --wpsc flag to update the site.

If you want to handle more traffic then you can try WP Rocket, if you have a subscript for the same or try Cloudflare Full Page Cache which will give you much better TTFB and reduce a great load from the origin server too.

nguyenvanhieu

nsgoyat Oh no, what I see is --wpredis is better. Install wp super cache not help my site handle more traffic. I just install wp super cache b/c the Newspaper theme recommend it.

nguyenvanhieu

nsgoyat If you want to handle more traffic then you can try WP Rocket

Thanks bro, i will test my site with this plugin 😅

nsgoyat

nguyenvanhieu It means you have two plugins for the same purpose i.e generate the page cache. If you're using --wpredis and have it properly configured then adding WP Super Cache won't make any single improvement at all. Also, give a try to "Redis Object Cache" plugin which might make your WP Dashboard and dynamic content rendering faster.

tyrro

One other suggestion is to check your MySQL config to see you have enough spare connections available.

You can also disable "Really Simple SSL" plugin and use natively supported SSL certificate via WordOps/Letsencrypt.

nguyenvanhieu

tyrro thanks