Ticket #17286 has been merged in sage-6.5.beta0 which should solve most
of the problems mentioned in this thread.
One major cause of recompilation what that Python implicitly depended on
$SAGE_ROOT/configure, which changes in every single Sage version. So
going from one beta to a different beta changes configure, requiring
recompilation of Python and everything depending on Python.
This big recompilation shouldn't happen anymore (assuming you switch to
branches including #17286).
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