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The next two big things to tackle are crate upload and yanking. Both perform the git operations to update the index in-band which is a major problem. Needs to be a background job.
Crate upload is even worse. Your crate goes to our servers before we proxy to S3. This actually puts a hard upper limit on the size of crate you can upload, based on connection speed. Needs to go direct to S3 (this requires cargo changes, so will be farther out)
*extremely @tenderlove voice* “cargo changes? Are you an auto mechanic? 
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