For "non-clickable" elements like polylines & polygons, Google uses
"mapslt", the successor to "mapsdt", to build a tile layer overlay.
Tiles are much faster than GPolys regardless of encoding. Rebuilding
a poly for each mouseover/mouseout is impractical. You could have a
pair of polys which you could toggle with hide/show.
You could try something like:
Static map version:
www.polyarc.us/poly
Dynamic map version:
www.polyarc.us/sparse
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