why shape map in power bi rendering slow ?

I downloaded the map from a government website and then put it into https://mapshaper.org/  to simplify it down to 0.75%. The map renders with suburb boundaries based on the locality in the file, I have measures that I put into the Color Saturation field and a few measures that I put in as tooltips.

Unfortunately, the file takes about 6 seconds to render when I change one visual to  the next visual 

I went to Options in the PBI desktop and increased the cache from 4096 to 8000 although the task manager indicates Power BI is only using 2000 ram when it is working.