[OpenLayers-Users] wmts layer with different server provider

[maven apache]

> 0,0,20,20 ==> http://server1/wmts.. (this means data inside the bbox of
>> (0,0,20,20) should request the data from server1.
>>
> If you ask this server for 0,0,40,40 will it only provide 0,0,20,20 or
> will it provide incorrect data for larger part of the area? If the former,
> then dont worry about it - just define  each wmst as layers and add them all
>

When ask server1 for data 0,0,40,40, data inside 0,0,20,20 will be served
normally, and data outside wil be returned as null.

BTW, we have almost 40+ wmts servers which server data at different
TileMatrix or different extent.

So I wonder if adding 40+ layers to the map will cause the performance
problem?
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