templating is slower when using dependencies with tagged version

[Diliz]

helm version: 3.15.2
kubectl version:

Client Version: v1.26.1
Kustomize Version: v4.5.7

Cloud Provider/Platform (AKS, GKE, Minikube etc.): Openshift

Hello there!

Currently using tagged dependencies like the following:

• mychart:1.0.0
• mychart:1.0.0+mytag
• mychart:1.0.0+0.0.0-mytag
• mychart:1.0.0+0.0.1-mytag

my Chart.yaml have the following dependency:

dependencies:
- name: mychart
  repository: "@myhelmrepository"
  version: 1.0.0+0.0.0-mytag

When I use the helm dependency build command then helm template, it's really slow, I don't know the real reason yet.

My chart uses a lot of templated functions in my case, but here is the difference in templating time:

• when using mychart:1.0.0: 4s
• when using 1.0.0+0.0.1-mytag: 1m32.556s (more than 20x the original templating time)

Did you already encountered this one?

[idsulik]

I couldn't reproduce it, could you please execute the slow command with "--debug" argument?

[Diliz]

I found the issue!

I got a .cache folder when I release my helm chart, for unknown reasons, I don't have performances issues with oci packaged charts when I try to template it.

So I did this tests with my chart (which contains a lot of templated functions) as a subchart:

• template with already builded chart from oci repository -> 1s
• template with already builded chart from helm repository -> 1m20s
• template with local chart -> 1s

The culprit was some cache folder present in the tgz from the helm repository only (dunno why, since it should be the exact same thing for the 3 cases I tried, I got a tgz file containing my chart in both of them at the end of the day), so I just added it to the helmignore, and it fixed the issue...

I don't really know how to reproduce this specific case.