Nautilus window bar menu commands cause abnormal CPU usage and "freeze"

[Alexey]

When i select commands from Nautilus window bar menu such as "New Tab", "New Folder", "Open in Terminal", the system freezes a bit and the processor usage can reach 60% on a 6th generation Intel Core i7.

For example, "Open in Terminal" opens the terminal in the current folder (as expected) and the cursor rapidly blinks for a few seconds, ignoring attempts to type anything at the prompt.

This abnormal activity does not happen if i choose "New Folder" or "Open in Terminal" from a pop-up menu, right-clicking in an empty space in the Nautilus window.

I am using Ubuntu GNOME 16.04.1. According to GNOME developers, GNOME 3.18 is not supported anymore:
https://bugzilla.gnome.org/show_bug.cgi?id=772945

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nautilus 1:3.18.4.is.3.14.3-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Uname: Linux 4.4.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Oct 22 14:03:28 2016
InstallationDate: Installed on 2016-08-24 (58 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)