I followed your step and it seems to be better now ! but only if I disable cache. Will I have to do it everytime ? 
We are looking into other loading issues, but what you are describing is different. Can you give me a specific location, and what steps you are going through?
Has the OP tried a different internet connection? Sometimes these problems are related to an unstable / weak internet connection.
Colin, you can see the address on the print screen that i send previously. The country is Portugal.
Although this problem appears in several areas, there are some that are all grey and some appears a small portion of the area.
I send a print screen of an area that loads almost completely except a square and send you the error message that is displayed on the devtools. Hope that this can help.
