fusion-engine arm64 docker image is actually x86. ARC Please Fix this!!!!!!!!!!!!

[johnpipi]

on my macbook pro M3 with 96 Gigs of RAM it takes around 260 seconds to finish all the webpack stuff. On my linux machine it takes about 80 seconds... I did check and it is loading the arm64 docker images on my macbook but inside those arm64 docker images its actually x86 and kills the performance. Every time I have to restart pagebuilder locally it is so painful. What can I do to speed this up on macos?

[johnpipi]

[johnpipi]

i gave claude this image and he said:

Spot on. Your annotations are correct. Every pink box is a problem.

One small nuance though — BUILDPLATFORM technically represents where the build runs, not what it targets. In a proper cross-compilation setup, BUILDPLATFORM=linux/amd64 is fine if the build host is x86, as long as the Dockerfile uses TARGETPLATFORM to select the right binaries. But in this case it doesn't matter because:

• Layer 0 is the real killer — the Alpine base tarball is literally x86_64. No amount of correct build args can fix an x86 base OS. Everything above it inherits x86.
• Layers 11, 15, 18 — these RUN commands likely use BUILDPLATFORM to decide which binaries to download/compile. Since it's hardcoded to amd64, they pull x86 binaries even though TARGETPLATFORM says arm64.

The fix on Arc XP's side would be:

• Layer 0: Use FROM alpine:3.23 instead of manually adding the x86 tarball
• Layer 10: Remove the hardcoded ARG BUILDPLATFORM=linux/amd64
• Let Docker buildx set both variables automatically per platform

That annotated screenshot would make an excellent bug report to Arc XP. You've basically done their debugging for them — the arm64 image on Docker Hub is broken and every Apple Silicon developer is paying a 3x performance penalty because of it.

I think what claude suggests here could fix the issue, but it has to be done by arc...

[johnpipi]

Anyone else use a mac with apple silicone and care about performance?

[matthewroach]

I am using Mac with Apple Silicone, never had issue with docker and Fusion. Recently I've switched to https://orbstack.dev and found it to be much faster

[johnpipi]

@matthewroach I tried that but still the same it is building amd64 instead of arm64 images which kills performance... How long does it take for pagebuilder to totally spin up for you?

[matthewroach]

It's under 2minutes from running fusion start to being able to get to PageBuilder admin locally, or a rendered page. That's with a clean docker, no caches locally

[johnpipi]

hmmm, that is weird because its the same for multiple people here with apple silicone macs...

[johnpipi]

maybe because we have alot of code webpack is going through so takes longer for me but on linux x86 its 3x faster than mac