Thanks Portofacil for your suggestion. Unfortunately it did not work. So I decided to reinstall everything from scratch monitoring performance step by step. What I discovered was that when I installed memcached + w3 total cache, following this tutorial https://easyengine.io/tutorials/php/memcache/ the performance issues begun again. htop showed high cpu usage when a simple post was saved (i.e. saving a post took 15 seconds of +100% cpu usage) while site was unresponsive.
Uninstalled memcached and w3 and now the only site installed run smoothly and fast.
Thanks
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Server so slow
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