I've spent some time playing with IE8 and VML.
After trying lots of potential solutions with no improvement, I tried
the following, which seems to allow a significant
improvement in polyline rendering speed on IE8

                document.namespaces.add('v', 'urn:schemas-microsoft-com:vml',
"#default#VML");

I only invoke this if I detect (using navigator.userAgent) that the
browser is IE8.
if anyone wants a look at my browser type detection code (which is
pretty trivial) let me know
and I'll put it up somewhere.

I've taken down the two test pages referenced above.

Cheers;
RB
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