I just downloaded your file : inkscape-12282-cairo-1.12.8.7z from April 19,
2013.
It runs fine for me, with just one rectangle with a radial gradient and very
fast dragging, 2 Windows machines.
Windows XP, CPU: Intel 2.2GHz, Display: Mobile Intel 965 Express Chipset
when dragging, Inkscape used 50% of CPU time, at rest it used 0%
Windows 7 (32 bit), CPU: Pentium 3.2GHz, Display: Intel G41 Express Chipset
when dragging, Inkscape used 40% of CPU time, at rest it used 0%
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