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Session saving in memcache. Сheckout page is load 16sec. From xdebug profiling i found out that the problem in function Magento\Framework\Session->regenerateId() session_start() exec 15 sec.
Why it so?
p.s if session save path set to file then problem is solving.
It is probably due to this core bug, which was patched in Magento 2.2.2: https://github.com/magento/magento2/issues/12385
