I found 4.2 version archive, downgrade solved an issue.
Fill free to update it to check whats wrong

It works, thanks

Really say – I’m ready to use grunt :)
I’m using VDS. And now, when popularity of Digital Ocean growing up – custom modules on a hosting isn’t a problem at all

Probably not.
The most Page-Speed penalty we get from blocking js. And the most problem is that we use nearly 20% of css and js.
There is a way to fix it!
Use phantom.js and grunt to remove unused code. It boost your site, but needs good development skills to make that operation :(

I’ve disabled w3 Total Chache.
But no change.
I try to use Oranienbaum for headings and Roboto Condensed for text. Chache is off, but nothing happence – still arial on a site,

And thanks for add_subset_func – you probably should add it to wiki, for all non english customers ;)

But mayby you have any ideas how to boost mobile perfomance?
Or for example fix content size for <span class=”avia-menu-text”>?

Yes. I fond problem.
It was WP Total Chache
Minify settings
I turned it off now
http://take.ms/Gm0jR
http://take.ms/Fvgei
just leaved html optimization