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middleman-s3_sync 4.6.5 released

I’ve just released version 4.6.5 of middleman-s3_sync, a gem that synchronizes Middleman-built websites to Amazon S3, with optional CloudFront invalidation.

Highlights

  • Thread-safe CloudFront invalidation path tracking (use Set + mutex) when running in parallel
  • Cache CloudFront client for fewer re-instantiations (with a reset helper for tests)
  • Single-pass resource categorization to reduce repeated scans
  • Batch S3 deletes with delete_objects (up to 1000 keys per request)
  • Stream uploads to S3 for lower memory usage; compute MD5s in a single read when possible
  • Faster CloudFront redundant-path pruning (O(n × path_depth))
  • CLI/extension now delegates option writers (e.g., verbose=, dry_run=) to avoid NoMethodError

These changes preserve default behavior but should improve efficiency and stability—especially on larger syncs with many deletes/invalidations or large assets.

Upgrading

Update your Gemfile to track any 4.6.x release:

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gem 'middleman-s3_sync', '~> 4.6'

Then run:

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bundle update middleman-s3_sync

Performance note

On my blog (light update set), wall time was essentially unchanged (≈7.7s new vs ≈7.7s old). The benefits primarily appear on larger deployments, where batching, single-pass categorization, and streaming help more.

Thanks

As always, the source is on GitHub and the gem is on RubyGems. Feedback and PRs welcome!

 |  Comments  |  Feb 15, 2026