maps on small devices) this is a huge win: instead of downloading *42 tiles* on a 500x500 div, we now download just 12, a 3.5x savings in downloads by default. The buffer of 2 was originally chosen when most maps were based on slow-loading WMS laeyrs and having an area to pan into was more important. That default no longer makes sense. (Closes #3111) r=tschaub git-svn-id: http://svn.openlayers.org/trunk/openlayers@11481 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
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