Error: technical difficulties

A really nicely featured plugin, but it does not work at all, I am trying with 20 posts and it takes forever without any response resulting that the whole site is under severe load and it gives to front end and backend that the site is experiencing technical difficulties, therefor the website is not working anymore.

Although it has nice features, but still it is dangerous to use. I do not suggest anyone to use until they know what to do if they have a problem of the site not working.