<blockquote>
<p>A more ambitious way to improve the reverting of edits would be extending the changeset upload to allow a "revert" block that can revert objects to earlier versions without actually transmitting the full earlier version</p>
</blockquote>
<p>I'm not sure this is really an issue. On a decent internet connection, uploading large changesets only takes a rather small fraction of the total processing time, the rest is spent on processing Rails code.</p>
<p>This will significantly improve once changeset upload is available via cgimap (<a href="https://github.com/zerebubuth/openstreetmap-cgimap/issues/140" class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="284592834" data-permission-text="Issue title is private" data-url="https://github.com/zerebubuth/openstreetmap-cgimap/issues/140">zerebubuth/openstreetmap-cgimap#140</a>). Mass downloading all of those objects to be reverted before uploading would be needed anyway to at least determine the current version numbers.</p>
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