Hi Guys,

I've read through the correspondence on this issue, but won't dive in
with reviewing submissions on this topic till well after 2.6.0 is out
the door.

As a general note, there seems to be two related topics - data
alignment and then SSE instructions, they are of course related but
I'd suggest we tackle them separately.

As another general note, in my experience the most common bottleneck
of scene graph based applications is that of CPU memory bandwidth,
maths functions are much less of a bottleneck, and there cost in fact
largely hidden by the cost of waiting for the cache to be filled.  The
performance profiles provided in this threaded suggest this as well -
with the traversal related methods being the biggest bottleneck.  How
to address this bottleneck is a topic for another thread.

Robert.
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