Cachix is really awesome. There's a few blog posts about using AWS S3 as a binary cache so you can roll your own. Unfortunately, this is really slow due to Ni

Cachix is really awesome. There's a few blog posts about using AWS S3 as a binary cache so you can roll your own. Unfortunately, this is really slow due to Nix using Brotli compression at a high compression level. There were some PRs to make the compression method configurable, but the last time I checked, none of them were merged. It is not really an issue if your outputs are small. But I had a private S3 cache and have some derivations that have large output paths, and it made CI excruciatingly slow.