CDK Synth is really slow in our environment - ho to analyze?

[markussiebert]

👋 Hello!

We see that our CDK Synth GitlabCI Pipelines needs several Minutes to synth an application that contains several stacks and a lot constructs.

The Problem is, it's really slow inside our corporate network - on my local machine that has normal internet access it's fast!

On my local machine:

npx cdk synth --verbose 5,04s user 0,68s system 114% cpu 4,988 total

Without direct internet access

real    2m12.380s
user    1m59.829s
sys     0m1.914s

the output is stuck for several minutes at this point:

[10:27:53] outdir: cdk.out
[10:27:53] env: {
  CDK_DEFAULT_REGION: 'eu-central-1',
  CDK_DEFAULT_ACCOUNT: 'redacted',
  CDK_OUTDIR: 'cdk.out',
  CDK_CLI_ASM_VERSION: '34.0.0',
  CDK_CLI_VERSION: '2.96.2'
}
... stuck ...

I think it has something to do with networking - maybe some IPs resolved via DNS are not reachable and the api calls timeout until the next IP is tried (we saw similar things with other API requests). Do you have any ideas how I can dive further into this problem?