I've been told that I have to make our current OpenLayers-based site faster, in
IE6-8. I know IE sucks both in their implementation of JavaScript, and using VML
instead of SVG. I also know that we're way over the recommended number of
features[1] and coordinates[2].
We have 700-800 roads in a GeoJSON file, that have been simplified using
PostGIS's ST_Simplify with a value of 850. The GeoJSON file is a static file,
generated periodically, and weighs-in at ~500 KB.
The simplified site can be found at [3]. The full version can be found at [4].
Currently, both sites take 30-60 seconds to load in IE.
The problem is that every single road needs to produce text when a user has
their mouse over it. I'm not allowed to implement things on-click. I'm not
allowed to use WFS to only load the roads visibile based on zoom/bounds. I'm not
allowed to reduce the number of roads.
With all of these restrictions, does anyone have any idea of how I can speed
this up?
[1]
http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#WhyisMyMapSluggishwhenIAdd500Markers
[2]
http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#WhatisthemaximumnumberofCoordinatesFeaturesIcandrawwithaVectorlayer
[3] http://map1.telenium.ca/sk.devel/en.html
[3] http://map1.telenium.ca/sk/en.html
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