<blockquote>
<p>I'm just not in favour of doing anything synchronously that could be done in the background.</p>
</blockquote>
<p>Ok, fair point. To keep that synchronous part of the overall process as small as possible, we'd really need to make sure that almost all CPU intensive stuff gets delegated to the asynchronous job. This includes decompressing and parsing GPX files, storing the results in gps_points, etc. The only thing left then would be take the uploaded GPX file, store it somewhere 'as is', and kick off some new job to process it.</p>

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