Buggy and resource demanding plugin

I really wish I could give this free plugin 5 stars, unfortunately, it is so buggy that I will have to give it a 2-star review.

After installing the plugin, my site slowed down by about 2 seconds on each page. This already indicates an unacceptable overload. Next, I click uninstall and deactivate the plugin. This doesn’t work. So I try again and it works. Then I try to delete the plugin from WordPress Plugins and the plugin reactivates. Now there are even assigned Events inside Events Manager. I make a request in the WP support forums and is now guided to uninstall the plugin by going to Events -> Settings -> Uninstall and Deactivate.

I try the solution and this works. I can then delete the plugin.

The only reason that I give 2 stars is for the support and for the potential of this plugin. For now, I have found a paid solution that I hope will be more stable. Best of luck in improving this. I really believe it needs a good overhaul.