MapStore2 JS-API Rendering Issue

[afabiani]

Description

All the application is rendered at every state change. The application will be rendered every time from scratch making it almost unusable.

The problem is getting worse especially with the latest versions of Chrome.

In case of Bug (otherwise remove this paragraph)

Browser Affected
(use this site: https://www.whatsmybrowser.org/ for non expert users)

• Internet Explorer
• Chrome
• Firefox
• Safari

Browser Version Affected

• Chrome version 78.0.3904.70+

Steps to reproduce

• Go to master.gemo.geonode.org and try to access any map or layer.

Expected Result

• The map is loaded smoothly without hanging at every event.

Current Result

• Whenever an event occurs on the map, everything is blocked until the load is finished.

Other useful information (optional):

Additional notes: we need this backported to 2019.02.xx