Scott (@scottsweb)

<p>Add Google style instant search and search suggest to your WordPress powered site. This plugin will begin displaying search results as soon as your site visitor starts typing into the search box.</p>
<p>The plugin requires very little configuration and should work out of the box with most themes. The plugin has its own options page to configure the plugin to work with your theme if you require it.</p>
<p><a href="http://scott.ee/" title="WordPress designer and developer" rel="nofollow ugc">a plugin by Scott Evans</a></p>


Instant Search & Suggest

Instant WordPress search with search suggestions for tags, categories and titles.

Alexandre Dieulot

<p>Make your site’s pages instant in 1 minute and improve your conversion rate noticeably. More info on <a href="https://instant.page/" rel="nofollow ugc">https://instant.page/</a>.</p>


instant.page

Like the title says, it's a must-have plugin unless you are in an extremely cheap hosting plan that limits very much your resources. Otherwise, perfect.

Must-have plugin

I always install this on any WordPress site I setup. The latest version works better than ever. I hope a future version adds the defer attribute so it loads last though to further improve initial page load.
e.g.
<script type="module" src="/wp-content/plugins/instant-page/instantpage.js" defer></script>

It really works! Excellent plugin

Make your site’s pages instant in 1 minute.

Instant Search & Suggest vs instant.page