> I wonder if reprojecting (about 6 layers?) and navigating
> can substantially decrease the performance?
Reprojecting your data on the fly, will always have a performance cost.
The cost is usually not much unless you're servicing a large volume of
requests.
For best performance, store your data in the same SRS as it will be
requested. Better to reproject once and forever, than with every single
request.
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