Hi Scott,
Haven't used this feature much recently so I don't know when it started happening, but the current beta is extremely slow displaying the 3D view, even when it is showing a small area with regular 3D settings. It used to pop up instantly (though don't remember what TF version that was). It has been slow for some number of versions now. Any ideas?
Nvidia 9600 GT
275.33 drivers (June 2011)
XP 32 bit SP3
AMD 5050e, about 50% cpu load while waiting
TF 4.21 beta
~92,000 vertices
2.0 texture detail
bilinear
download/cache
Thanks,
Steve