Nginx slow load of php page

[Y. Yaax]

I am running nginx with php-fpm by fastcgi. All config settings are
default. And since few days all php pages became very slow loading. Even
simplest php script take about ONE minute to execute. Server is not
loaded - its load is almost alway less then 1 - in average is 0.5, but
php pages are still loading very very slow!
Note that on the same server I am running Apache on different ip - not
connected to nginx and not by proxy with nginx. And php on apache pages
is loaded very fast, while through nginx it is loaded very slow!
What can be reason of such problems and how can I fix it?
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