In case you don’t know, since recent versions (4.4 vicinity) WordPress is including various scripts that slow down your site in the core.
Emoji and Embed scripts.
Each of them include over 2-3 JS and CSS files, and load for every visitor who comes to your WordPress site. Check your WordPress page source through your browser – if you see any styles and scripts with the name wp-emoji-* or wp-embed-*, you have them.
The problem with these scripts is that they collectively add ~0.5 to ~1.5 seconds of time to your page load speeds, depending on your setup, host and connectivity. That’s a big deal in our time and age, in which visitors expect a page to load in about ~2 to ~3 seconds. 
Especially when you are not using either of these… And in case you don’t know what these are, then you are very probably not using any of them.
Embeds are for ‘easy embedding’ YouTube videos, Twitter Tweets, Audio and ‘other content’ to your posts. .
So, you don’t need what WordPress forces with the recent cores.
Then what about Emoji?
They are stuff like these:
Have you used any of these in any of your posts? Why would someone even need to use one in a semi-useful blog post, leave aside why would any developer think that it would be a good idea to include these in WordPress core?
Some say that these scripts will be useful for Asian languages. But hey – in case your website is not catering to any asiatic language, that’s not a point either.
So, its better to just disable these scripts until WordPress team gains the good sense to not include stuff majority of people won’t need in WordPress core.
How to go about doing that?
Just paste the following code to a plugin, and activate it.
What these will do is to disable all hooks, filters, queues related to Emojis and Embeds, everywhere. Even speeding up your admin a little bit.
In case you can’t get hassled by popping the above code into a plugin, just download the below ready-made one, upload it to your WordPress and activate it. Its the same code above, except zipped into a plugin. And that’s it.
CodeBard Disable Peskies – WP Emoji & WP Embed
Ah, if you are using our Rapier Theme, you don’t need to use this plugin since this code is included in speed optimizations and you can just turn them on/off in General -> Advanced JS and CSS settings options.