<blockquote>
<p><a href="https://github.com/pnorman" class="user-mention">@pnorman</a>: for me the big difference is disk space</p>
</blockquote>
<p>I don't see a disk space difference</p>
<p><a href="https://cloud.githubusercontent.com/assets/1190866/21739261/81b60d30-d44b-11e6-84bc-2f20b5c8b017.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/1190866/21739261/81b60d30-d44b-11e6-84bc-2f20b5c8b017.png" alt="image" style="max-width:100%;"></a></p>
<p>The big DB size spike is at the end of processing, right before the slim tables are dropped.</p>
<p>Left is <strong>current master</strong>, right is this PR.</p>
<p>Testing this PR vs HEAD~ for memory</p>

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