Hi,
I just begin using the geoserver wps and I'm quite surprise of the 
performance and implemented processes. Very good.

I have a use case that works but would like to improve. I would like to 
use the equivalent of ST_DWITHIN in postgis, but on 2 WFS.

I'm using 2 WFS having point features.  I need to get the points of WFS1 
that falls within a 1km buffer on each points of WFS2. I made it using 
gs:InclusionFeatureCollection and a subprocess gs:BufferFeatureCollection
It works but it takes 20 seconds. The same query directly in postgis takes 
also 20 seconds (st_within(geom1, st_buffer(geom2,1000))

in postgis st_buffer should be avoid if there is other way, like 
st_dwithin(geom1, geom2, 1000) on the same data takes 1 seconds.

Is there other processes I could use instead of those above? 
Thank you 
Steve
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