It isn't your computer, your connection or our processing. It has to do with the software we are using to display the tiled map.
We are not using the Google Maps API directly. We use Leaflet Maps which supports more of the 3rd party tools people like to use. To use Google Maps with Leaflet Maps we use a translator called Google Maps Mutant. Google Maps has changed a bunch of stuff with their service recently and Google Maps Mutant doesn't work as well as it used to. We are aware that the display isn't perfect and are working to address the issue.