Smaller images are also another way to go. At my last company, image sizes were like 2-3Gb. I was able to prune that down to ~1.5 GB. Boost and a custom clan

Smaller images are also another way to go. At my last company, image sizes were like 2-3Gb. I was able to prune that down to ~1.5 GB. Boost and a custom clang/llvm build were particular major offenders here. There's quite a bit of cruft that can be pruned.