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I have found an interesting article about how HTML5 supports representation on large datasets. Article can be found here. In the article it is said that HTML5 and feature simplification can increasingly improve visualization speed. Does anybody knows about the source code (or just explain what is needed to be done to reach such results) or suggest how OpenLayers supports feature simplification?

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Thanks for posting the link to the article! I don't think that OL supports <canvas> rendering yet. However, they state that their code could be ported to OL. Apart from that wouldn't it make more sense to do the simplification at server level, i.e. in WFS? Why lift all that data over to the client, to then not show it? –  bhell Dec 12 '12 at 21:16
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Most of the heavy lifting is done on the server side.

A really complete run down of technically how this is achieved at How to create Vector Polygons at the same amazing speeds GISCloud is able to render them?

As for supporting this rendering, OpenLayers has support for the HTML5 Canvas element, as per What is the state of the art in html5 geospatial applications?, so with additional client side code, it too could support this type of vector data.

Unfortunatley, aside from GisClouds paid for offerings, I haven't seen anything on the opensource server side of things that supports serving up this type of rendering format.

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