Upgrade to 5.6 is breaking everything

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So I just upgraded to 5.6 thinking it was going to be great and all it did was break my site. I am finding a bunch of threads explaining how its bogging down servers which is happening to me. I am getting 500 Internal Server errors on simple webpages even though I never had this issue before, someone on Concrete5 dev team needs to address this fast. It is a major issue. I am also getting Fatal Out of Memory message and I tried using

ini_set("memory_limit","128M");

on my index.php file and nothing. Its only happening on some pages not all. Like About us, Where to Play

http://s434399832.onlinehome.us/brainsportz/...