Docker builds extremely slow

I’m currently building docker images on Render, and have run into an issue where a specific step stalls on all builds. This step is:

#10 [internal] load metadata for
#10 DONE 300.5s

However, it’s a multi-stage build and the specific stage it stalls on is either this one or any of the others (including git, python, etc.). I’ve communicated with Keith from Render support, and haven’t heard any response for over a week now. I’m wondering if anyone else in the community has seen this issue.

It’s really frustrating because we’ve optimized our build pipeline to run in <5 minutes, but this single step is causing us to more than double our build times and significantly slow down our CI/CD pipelines.