+More not working

Looks like your caching plugin is being a little too aggressive with the minifying of scripts.

Try disabling your minifying settings and see if that fixes it.

If it does, you'll want to manually specify which scripts to minify, and you'll want to exclude the core jQuery file.

That was it. I've disabled a few things and it works. Blog is quite slow, so I was trying to optimise it.

Slow loading can mostly be tracked back to your hosting provider.

However, one of our members made a great post here on which plugins work best: http://generatepress.com/forums/topic/google-speed-test/#post-122818