> This sounds suspicious to me. In my experience, Rosetta is faster on my M1 MBP than natively on my 2015 x86 MBP.

The performance will obviously depend on the workload

> How did you measure this?

Running the exact same docker image based on this: https://github.com/chriz2600/xilinx-ise And the code from this git repo of mine: https://github.com/LIV2/GottaGoFastRAM2000

Inside a Debian vm:

  docker run --rm -it -v ${PWD}:/build -w /build xilinx-ise /bin/bash

  cd RTL
  make clean
  time make ../Binary/XC9572XL/gottagofast2000.jed

When I get a chance I will check the timing of each individual step from the makefile.

If there is something I'm missing I'd love to know, I'd rather not have to run my builds on another machine

> Running the exact same docker image [...]

I don't think Docker supports using Rosetta to run x86 binaries inside arm64 containers. Here's an open feature request for it: https://github.com/docker/roadmap/issues/384

I'm not using docker desktop, I'm using docker inside a Debian VM.

I'm using an x86_64 container and it's definitely using Rosetta via binfmts because if I remove that the container won't even start