This is a FAQ, but the group's search has problems finding it.
Copied/pasted from another thread:

Basically you have two options:

1. Custom tiles, for which there is a video on YouTube by John Coryat
describing the methodology. (Just search YouTube for 'John Coryat')

2. Server side clustering, (2 slightly different versions):
http://maps.forum.nu/server_side_clusterer/
http://maps.forum.nu/server_side_clusterer/index2.php
(not a free script)

--
Marcelo - http://maps.forum.nu
--


On May 11, 9:11 am, Ali <[email protected]> wrote:
> Hi guys, I have a database with over 120 000 coordinates that I need
> to be displayed on a google maps integrated in my application. The
> thing is that and I've found out the hard way simply looping through
> all of the coordinates and creating an individual marker for each and
> adding it using the addOverlay function is killing the browser. So
> that definitely has to be the wrong way to do this- I've read a bit on
> clustering or Zoom level bunching - I do understand that theres no
> point in rendering all of the markers especially if most of them won't
> be seen in non rendered parts of the map except I have no idea how to
> get this to work.
>
> How do I fix this here. Please guys I need some help here :(
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