I apologize for my bad english.
Moodle 3.4.1 (Build: 20180115) with the boost theme
Server: Localhost via UNIX socket
Server type: MySQL
Server version: 5.7.21-0ubuntu0.16.04.1 - (Ubuntu)
Protocol version: 10
Server encoding: UTF-8 Unicode (utf8)
PHP: 7.0.28-0ubuntu0.16.04.1
my problem:
Administration page and course page Waiting (TTFB) ~10seconds
This problem occurs after the system is upgraded from 3.2.