If you can write your posts in 2 or more(Woo…) languages within one blog, you might want to tell the client browser the language attribute of you posts.
According to <a href="http://www.w3.org/International/tutorials/language-decl/en/all.html" title=" W3C tutorial" rel="nofollow ugc">the tutorial on W3C</a>, language attribute can be declared in the container html tag of your post like this: 
<div id=”post_id” class=”post_entry” lang=”zh-Hant” xml:lang=”zh-Hant” dir=”ttb”>… 
Here “zh-Hans” is the language attribute of your post which means it’s written in Simplified Chinese.
This plugin gives your post a language tag by adding a meta deta to that post.
To add language tag, select it from the language box when you compose/edit a post. Select “None” will delete the language tag.
<h3>Revisions</h3>
2007-12-18, 
0.2: Now you can difine language direction. 
 Insert CSS style into page head automatically to support pretty printing.
 readme file updated for new feature and fixed a error
2007-07-23 
0.1: First release

Multilingual post

This plugin adds a standard compliant language tag to your post and page.

enomoto celtislab

Although you may have installed a lot of plugins, you may not want (or need) them activated for all of your posts and pages. With this plugin, you will be able to deactivate unnecessary plugins for each individual post and page.
By filtering the activation of plugins, you can significantly speed up your website.
Features
<ul>
<li>Support Post Format type</li>
<li>Support Custom Post type</li>
<li>Support Jetpack Modules filtering</li>
<li>Support WP Embed Content card (is_embed template)</li>
<li>Support Simple Post Language Locale switcher</li>
</ul>
In addition to blog posts and pages, for example providing services as a Web application, you can also distinguish the plugins for blog and Web applications.
<h4>To further performance up plugin</h4>
<a href="https://wordpress.org/plugins/yasakani-cache/" rel="ugc">YASAKANI Cache</a> is a simple and easy to use super high speed page cache.
For more detailed information, there is an introduction page.
<a href="http://celtislab.net/en/wp-plugin-load-filter/" rel="nofollow ugc">Documentation</a>

Plugin Load Filter


Though I'd like a revamp of the UI the result of filtering our REST-API and REST-API WC plugins makes a TON of difference.



We went from updating 3000+ products in 60mins to updating them in 15mins.



Awesome! Well worth the purchase.


Awesome! REST-API 4x speedup!

Dynamically activate the selected plugins for each page. Response will be faster by filtering plugins.

Multilingual post vs Plugin Load Filter