> > I remember seeing 60-70% reduction really often, and 90+ periodically.  I've
> > read Kevin's explanation of why it's not working as well now, but I wonder
> > what changed between the early implementation when results were very good
> > and now, when they really aren't.
>
> I think it's because you only see deltas from N to N+1 now and before
> you saw deltas from N to N+X before. So, I think if we made it somehow
> create older deltas, you would again see better savings. The issue
> doesn't just cause there to be fewer deltas, but it also causes those
> few be be against very recent changes, so less effective.

Would it make sense (and possible to implement fairly easily) to
generate deltas weekly instead of daily? That may already be a good
start; as I’d imagine bandwidth constrained users would generally try
to update on a weekly or monthly basis.
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