Here's a link to my response to a similar question on gis.se:

http://gis.stackexchange.com/questions/18572/openlayers-alternatives-supporting-more-client-side-features/18591#18591

While I am not sure you can push 1M records to the browser without blowing
it up it gives some pointers to get started with.

hth,
Umberto



On Fri, Jan 23, 2015 at 11:01 PM, zach cruise <[email protected]> wrote:

> we need to map points, a lot of them. they can only be vector and most
> likely static geojson/svg - so no geoserver clustering in the backend
> - also want to avoid maptiler:
>
>         1 mil records
>         200 mb geojson
>         download time 20 sec (over 1.5 mbps)
>         dom ready 15 sec (with 2 gb ram)
>
> obviously we are also looking at modest maps in addition to openlayers.
>
> any real world ideas?
>
> can anyone point to a web map with the most vector points?
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