47 lines
1.8 KiB
Plaintext
47 lines
1.8 KiB
Plaintext
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Current for 6.x-2.0-alpha3
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Obviously there are many points at which advanced users will want to push the
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limits of what the OpenLayers module can do. In many cases, these changes can be
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make without any 'hacks' to the module, and before hacking, it is highly
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recommended to think about ways that changes could be incorporated into the
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module proper via patches.
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# Performance
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The largest performance hit of OpenLayers at the moment seems to be in the very
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large size of the OpenLayers.js library. The real route to fixing this problem
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is by narrowing down the set of components included in the Javascript file. In
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order to do this:
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## Manually
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svn checkout http://svn.openlayers.org/trunk/openlayers/ cd openlayers/build
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edit full.cfg or lite.cfg to include the components your map uses.
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python build.py [yourcustomized.cfg]
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This will produce a compacted, slimmed OpenLayers.js file.
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After doing this, make sure to set the ImgPath and ThemePath in the OpenLayers
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administration - these are per-map settings. The OpenLayers library guesses
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the location of its style.css and images, so if you make a compacted
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OpenLayers.js in an otherwise empty folder, it will fail in this task and have
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blank images and a nonfunctional ZoomBox control (the red 'zooming box') will
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not appear.
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## Map Performance
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Using multiple domain names for layers will [dodge the browser connection
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limit](http://trac.openlayers.org/wiki/OpenLayersOptimization) and allow more
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tiles to load in parallel. However, this has a bad interaction with the default
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buffer setting, making tiles outside the viewport load first in many cases, so
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buffer should be set to 0 if multiple urls are enabled.
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# Custom Behaviors
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If behaviors similar to those included are necessary, just clone the behaviors
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and create a tiny new module that includes the copy. The same goes for layers,
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etc.
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