Attila Gyorbiro

Eazly Content Generator allows you to generate realistic placeholder content directly inside your WordPress admin. You can:
<ul>
<li>Generate posts, pages, and custom post types.</li>
<li>Insert paragraphs, headings, blockquotes, images, lists, and other content elements.</li>
<li>Choose which content elements to include.</li>
</ul>
This plugin is ideal for developers, designers, and content creators who need to populate their site with sample content quickly and efficiently.
<h3>Additional Notes</h3>
<ul>
<li>PHP 7.4+ recommended</li>
<li>WordPress 6.0+ recommended</li>
<li>Requires GD library if generating images</li>
</ul>

Eazly Content Generator

Quickly generate dummy content for posts, pages, and custom post types. Ideal for theme development and testing.

This plugin generate automatic post/page/comments/Users/media/terms with random content | It’s Perfect for WP developer. 
PHP 7.0.1 is required.
PS: 
If you have problems with that maybe you just need to upgrade you memory_limit inside Php.ini 
I recommend to set memory_limit on 512M.

AutoRadomContent

This plugin generate automatic post/page/comments/Users/media/terms with random content | It's Perfect for WP developer.

Eazly Content Generator vs AutoRadomContent