Low fps and freezes on Google Maps

Device:

iMac (Retina 5K, 27-inch, 2017)

3.8 GHz Intel Core i5

8 GB 2400 MHz DDR4

Radeon Pro 580 8 GB

OS:

macOS High Sierra (the same issue was on Sierra)

Safari:

Version 11.0 (13604.1.38.1.6) (the same issue was on previous Safari version)

Problem:

Google maps run very slowly with significant fps drops and freezes when the window size is wider than about 80% of desktop width and in full screen mode as well. The issue is not reproducible in the latest version of Chrome browser.

Safari 11 - Google Maps Fullscreen issue (iMac 2017 5k) on Vimeo

What I tried in order to fix this issue:

• update OS version (from Sierra to High Sierra)
• update browser version
• clear OS install
• disable 3d party plugins
• enable high contrast mode in OS
• Disabled "Stop plugins for power save" option