Scrolling Google Maps is slow for map, slower for satellite view (black areas appear), same for 3D view, loading Street View pictures takes about 10 seconds. None of these happen with Chromium browser - all is smooth. I am using an older laptop: Toshiba Satellite 2-processor Intel 2GHz, Linux Mint Bionic/Tessa. Network is 10 Mbps up and down.

This has happened before. Any thoughts?