In broad strokes, another possible approach for a grid is to:
1. Detect the bounds
2. Establish a larger 'viewport'
3. Build the grid with polylines (MVC array) that cover the larger
viewport.
4. Listen for a change in the map center and rebuild the grid
5. Consider changing grid scale based on zoom

If you are not required to use polygons to build the grid, then
polylines might be a better approach.

You can judge performance:
http://www.mappingsupport.com/p/gmap4.php?ll=39.626861,-104.942131&t=t1&z=10&coord=utm

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