After checking further on your site, I suspect the moment it loads slowly is because JCH Optimizes the plugin trying to compress the page CSS and Javascript so it will load slowly when you first access it.

You can watch my attached 2 videos before/after activating JCH optimize plugin test result.

1. Without enabling JCH Optimize plugin, it will always load pretty fast no matter what I test.

2. With the enabled JCH Optimize plugin, it will load slowly sometimes but it will load fast when you access it next time, I believe this JCH Optimize plugin trying to compress at the first time then when you access the page again, I suspect it will load from the cache file so it will load fast.

Also, you can't compare with the other extension why this only happens on Easyblog load slow sometimes:

1. Both extension HTML DOM structure is not the same.

2. Both extension CSS stylesheet and Javascript does not load the same.

3. And nobody here can understand how this JCH Optimize plugin compression works since this 3rd party component is not developed by us.