Ok, I get your point here. I contacted with one rep of 1&1 and he advised to renew the package for unlimited one.. I did it and now it seems like everything works fine (and php miraculously changed from 4.4.9 to 5.2.17 - amazing!). I don't know for how long though. Unlimited RAM on shared server sounds to me like "all what you can get is yours" .
But anyway. I'm looking forward for new version of s9y with comments pagination. And thank you personally for being supportive with my trouble.
Have a great day to all!