I gave the latest nightlies a shot, and performance has indeed much improved! 

Using BigGridDemo, I can generate a 300k / 125-col sheet in between 2 and
2.5 minutes.

Using the AutoFlush example, I can generate the same dimension file in about
4.5 minutes.

Using the second example, but flushing all rows (flush()), I can generate
the same dimension file in about 3.5 minutes. 

So, not quite as fast as the BigGridDemo example, but a heckuva lot easier
to read.

Thanks for all the work, folks!

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