You can try James or Chad proposal.
If you have a lot of markers you can also have a look to maptimize
(http://v2.maptimize.com).
I know it's not open-source and not free (we have a free account).

We are compatible google maps V2 andV3. You'll be also able to filter
your map by projects/tags in real-time without reload the page.

You can contact me, we can extend the free account for your service.
I do also open source projects and it will be a pleasure to help.

Seb

On Jul 1, 7:46 am, James McGill <[email protected]> wrote:
> FusionTablesLayer may also be suitable in this case.
>
> Regards,
> James
>
> On Thu, Jul 1, 2010 at 9:25 AM, Chad Killingsworth
>
>
>
> <[email protected]> wrote:
> > Scrolling is slow because of the number of DOM elements. With a KML
> > layer, it would be a HUGE speed improvement.
>
> > This also looks to be a prime candidate for marker clustering.
>
> > Chad Killingsworth
>
> > On Jun 30, 4:43 pm, Raphael Krut-Landau <[email protected]> wrote:
> >> Hi,
>
> >> I have a map set up at <http://openhatch.org/people/>. It has a couple
> >> thousand markers. When you scroll, the map shudders and hangs a bit.
> >> How can I make it faster? What do you do to keep a map displaying this
> >> much information scrolling smoothly? Are there "best practices" within
> >> Google Maps v3, or add-ons I should use?
>
> >> Note that the scrolling of this map is pretty fluid when there are
> >> fewer markers, e.g., <http://openhatch.org/people/?q=project
> >> %3ATwisted>.
>
> >> Best,
>
> >> Raphael
>
> >> p.s. Something we've thought about: We're generating the markers in
> >> JS. We could use KML, but we don't think that would make it go faster,
> >> because it's the scrolling that's slow, not the marker-making.
>
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