> Is this a normal situation that mouseover and mouseout events are
> detected very slowly and not precisely?

For  polys, yes.  The API has a lot of work to do to test for the
events, even though some approximation is used to keep the speed up.
I don't know that the more numerous and complex the polys are, the
slower it works, but that would seem a reasonable consequence.

There used to be a Google blog post (2007) about the algorithm used,
but that seems to have got lost when they changed the blog.

For poly cursors, there is an outstanding issue -
 
http://code.google.com/p/gmaps-api-issues/issues/detail?id=181&colspec=ID%20Type%20Status%20Introduced%20Fixed%20Summary%20Stars%20ApiType%20Internal
and there is a workaround you may be interested in.

cheers, Ross K

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