test: remove code that rendered stale map data tiles from cache before retrieving from the network - will try it for a while and see if it makes things noticably more responsive
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@ -253,10 +253,10 @@ window.MapDataRequest.prototype.refresh = function() {
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// no fresh data
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// render the cached stale data, if we have it. this ensures *something* appears quickly when possible
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var old_data = this.cache && this.cache.get(tile_id);
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if (old_data) {
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this.render.processTileData (old_data);
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}
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// var old_data = this.cache && this.cache.get(tile_id);
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// if (old_data) {
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// this.render.processTileData (old_data);
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// }
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// tile needed. calculate the distance from the centre of the screen, to optimise the load order
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