XMind is the most professional and popular mind mapping tool. Millions of people use XMind to clarify thinking, manage complex information, run brainstorming …

On Ubuntu 16.04 is have a bug that make the application lag and slow (read here)

This article show you how to fix it:

We will create a dash shortcut to startup application with modify environment.

Step 1: [Create bash script file to start Xmind] Create a file name start_Xmind in /opt/xmind-8-update1-linux/XMind_amd64/. Note that /opt/xmind-8-update1-linux/ is location where is I put my Xmind application.
File content:

This bash script will open XMind with option SWT_GTK3=0

Step 2: [Create dash shortcut] Create a file name xmind.desktop in ~/.local/share/applications/
File content:

That is! Done.

Xmind also have a cloud version here: https://cloud.xmind.net/