[OpenLayers-Users] Re: How to manage huge amount of vector features

[Norbert Renner]

There has been a discussion [1] about demos that claim to render more 
than 2.000.000 features in the browser (not with OpenLayers though).

The trick seems to be using:

- HTML5 canvas [2] - note: not available on all Browsers
- feature simplification/generalization up to single pixel replacement
- vector tiles (just like XYZ tiling scheme)

[1] 
http://osgeo-org.1803224.n2.nabble.com/GisCloud-showing-tons-of-vectors-features-on-Web-Browser-tt6817879.html 

(esp. answer from dravnic)
[2] http://openlayers.org/dev/examples/canvas.html