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How to cut your Docker build time by 95%, Buildx, Caching & Layer Optimization
Docker builds taking forever? I cut mine from 8 min to 24 sec. Here's how using Buildx and caching.
Docker
Buildx
Optimization
CatOps
Apr 12, 2026 12:20
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Table of Contents
Part 1: Why your builds are slow
The layer cache and its domino problem
Build context bloat
The base image tax
Part 2: The fundamentals (get these right first)
2.1 Reorder your Dockerfile: dependencies before source code
2.2 Add a proper .dockerignore
2.3 Use slim base images
2.4 Use multi-stage builds
Part 3: BuildKit, Docker's modern build engine
3.1 Parallel stage execution
3.2 Cache mounts (--mount=type=cache)
3.3 Bind mounts (--mount=type=bind)
Part 4: Buildx cache backends (sharing cache across machines)
4.1 Cache backend types
4.2 min vs max mode
4.3 Multi-source cache imports
4.4 GitHub Actions: full example
Part 5: Avoiding sneaky cache busters
Part 6: Putting it all together
Cache mount targets by ecosystem
Checklist
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Apr 12, 2026 18:10
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Table of Contents
Part 1: Why your builds are slow
The layer cache and its domino problem
Build context bloat
The base image tax
Part 2: The fundamentals (get these right first)
2.1 Reorder your Dockerfile: dependencies before source code
2.2 Add a proper .dockerignore
2.3 Use slim base images
2.4 Use multi-stage builds
Part 3: BuildKit, Docker's modern build engine
3.1 Parallel stage execution
3.2 Cache mounts (--mount=type=cache)
3.3 Bind mounts (--mount=type=bind)
Part 4: Buildx cache backends (sharing cache across machines)
4.1 Cache backend types
4.2 min vs max mode
4.3 Multi-source cache imports
4.4 GitHub Actions: full example
Part 5: Avoiding sneaky cache busters
Part 6: Putting it all together
Cache mount targets by ecosystem
Checklist
How to cut your Docker build time by 95%, Buildx, Caching & Layer Optimization
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