Ingress sync delay when creating 1000+ ingresses simultaneously

[haim-bp]

When creating a large number of ingresses (~1000+) at the same time on EKS v1.31 with nginx-ingress-controller v1.12.4, I noticed inconsistent sync behavior:
• Some ingresses sync immediately and get the LoadBalancer IP.
• Others take 8–10 minutes before they are scheduled for sync and updated with the LB IP.

Example event log from delayed ingress:

Normal Sync 7m47s nginx-ingress-controller Scheduled for sync

Steps to Reproduce
1. Deploy an nginx-ingress-controller (v1.12.4) on EKS v1.31.
2. Create ~1000 ingress resources simultaneously.
3. Observe ingress status updates in kubectl describe ingress.

Expected Behavior

All ingresses should sync and receive the LoadBalancer IP within a reasonable timeframe (a few seconds to 1–2 minutes).

Actual Behavior

A subset of ingresses takes 8–10 minutes to sync and become available.

Environment
• Kubernetes version: 1.31 (EKS)
• Nginx ingress controller: 1.12.4
• Number of ingresses created: ~1000+ simultaneously

Questions
• Is this behavior expected due to configuration or scaling limits?
• Are there any known limitations when creating thousands of ingresses at once?
• Is there a recommended configuration tweak (e.g., worker tuning, queue size, resync period) to avoid this delay?

[k8s-ci-robot]

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[Gacko]

Please fill in the form provided when creating this issue. Thank you!

Apart from that: Have you tried disabling the full config test on sync (--disable-full-test)?

https://kubernetes.github.io/ingress-nginx/user-guide/cli-arguments

[haim-bp]

Please fill in the form provided when creating this issue. Thank you!

Apart from that: Have you tried disabling the full config test on sync (--disable-full-test)?

https://kubernetes.github.io/ingress-nginx/user-guide/cli-arguments

We try to use the --disable-full-test but it didn't change the behaviour

I create this issue from scratch, do you need something in specific?