In my application, I use a map service with about 200 map layers. Users can manually toggle these map layer's visibility.
These map layers normally have between 1500 and 7000 objects.
It takes a long time to load some of these layers (maybe a minute). Users respect that because of the amount of objects (although it would be great to speed it up...)
But it's really strange that not all objects are being loaded. And even more strange is that for some layers it works. And the most strange thing is that it seems to work with Firefox, but not with Chrome.
See screenshot: These map layer has 6987 objects. It only shows the objects north of Switzerland.