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In previous release,
MgMap is created on Web Extension side. During its process, it gets a layer
collection from MapDefinition, and iterates in the layer collection to create
runtime layer definition models one by one. This way, multiple requests may
be sent to server side to get resources (layer definitions), according to how
many layers this map has. When the layer amount is too high, the
communications between Web tier and server will be the bottleneck of
performance. In new release, we get a
batch of resource contents in a single round trip.
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