High TTFB for NextJs application

[Akhilesh-aarzoo]

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App Id

dyyv7k61mxhcc

AWS Region

us-east-1

Amplify Hosting feature

Not Applicable

Describe the bug

We have a NextJs application hosted on Amplify. We are seeing high TTFB for our application in production. We are getting this problem without any changes at our end. This is happening since 2:30 AM UTC today.

Expected behavior

TTFB should not take so long. It should be back to normal.

Reproduction steps

1. Deploy a NextJs app on Amplify on us-east-1
2. Use the hosted application URL on browser and check the Network tab

Build Settings

version: 1
frontend:
  phases:
    preBuild:
      commands:
        - yarn install
    build:
      commands:
        - npm run build
  artifacts:
    baseDirectory: .next
    files:
      - '**/*'

Log output

# Put your logs below this line

Additional information

No response

[rebeccatay92]

Can confirm this is happening on our Amplify applications as well, starting this morning. Vanilla React is ok but NextJS applications hv high TTFB (sometimes > 20s)
App Id d1bzv6vd8539jw
AWS Region us-east-1

Hi @Akhilesh-aarzoo and @rebeccatay92 some SSR applications can have a high initialization time depending on which dependencies are needed to start the application. You can check your app's initialization time locally by following our guide: https://github.com/aws-amplify/amplify-hosting/blob/main/FAQ.md#measure-compute-apps-initializationstart-up-time-locally.

[ArianHamdi]

Same here also.

[Akhilesh-aarzoo]

@hloriana - Why are we seeing high TTFB all of a sudden? We didn't make any code changes/deployments. Did something change in AWS Amplify yesterday?

[ferdingler]

We are looking into this

[timedtext]

@ferdingler Please take a look at my discovery. #3359 (comment)

[jbreemhaar]

@ferdingler Please have a look at #3211.
Issues for me started since migrating WEB_COMPUTE two days ago.

[ArianHamdi]

@ferdingler Please have a look at #3211. Issues for me started since migrating WEB_COMPUTE two days ago.

High TTFB in 03/08 & 03/09