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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Have you thought about combining all the WFS services into a single call and then managing the filtering on the client side. This would also work for the hover control, in that
you could pull multiples based on a hover action and still use some sort of buffer to handle things that are clustered as well as multiple selects. This could reduce the amount of data being pulled on demand to an acceptable level, performance wise. It also
allows you to do global searches since all data is handled by a single service.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">bobb<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> openlayers-users-bounces@lists.osgeo.org [mailto:openlayers-users-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Roel De Nijs<br>
<b>Sent:</b> Tuesday, November 04, 2014 10:32 AM<br>
<b>To:</b> openlayers-users@lists.osgeo.org<br>
<b>Subject:</b> [OpenLayers-Users] Alternatives to get rid of WFS layers<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi list,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">We have a web application displaying some geographical data (about the sewerage system) and using OpenLayers 2.13.1 as front-end library
(geoserver as back-end). Currently we have +- 30 object (feature) types. Every object type has a WMS and WFS layer in the map. The visibility of each object type is dependent on a minimum/maximum zoom level and/or can be turned off by the user. The user can
perform a set of standard functions on the map (zoom, pan,…) and each feature (hover, select, double click,…).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Everything works fine, but the main criticism about this application is (very) poor performance, being (very) slow and making the browser
freeze. Sometimes the only option is to close the browser and start again. Not the most user-friendly approach.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">We did some testing related to the performance. One of the things we noticed, WFS data has a huge impact on performance. From a certain
zoom level, the WFS data (for all layers) retrieved the server is 750KB – 1MB (and that’s the gzipped version). It takes some time to load all this data (certainly if the user is on the road) and also to process the data. If you zoom and pan a few times, you’ll
probably have to close your browser (mostly IE) and start over again. Users sometimes have to wait 15-20 seconds before a pan or zoom request has finished, which is inacceptable from a user’s point of view.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">I can’t imagine this application is the only one having to deal with so much WFS data, so I was wondering how other developers managed
big amounts of WFS data and keeping their web application responsive while loding/processing the WFS data.
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Or maybe some alternative/work-around exists to get rid of the WFS layers/data, but still keep the feature functions (like hovering, (multiple)
selection, box selection, double click,…)?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Another path I have already experimented with is loading the WFS data on-demand, because the user is probably not interested in all features
but only in some of them. Using the GetFeature control I’m able to get the features underneath the mouse cursor. But I’m wondering how I can incorporate all other feature functions. Because e.g. the Select control uses a wfs layer, but the layers doesn’t contain
features anymore. <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">I’m really desperate, so I appreciate all insights, suggestions, pointers, hints, a lot!
</span><span lang="NL-BE" style="font-size:10.0pt;font-family:Wingdings">J</span><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Roel De Nijs<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="NL-BE" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Senior Java Developer<o:p></o:p></span></p>
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