route53 and ELB latency

Question

Hello,
I use an ALB on the front of my application (deployed on ECS). And I use route53 in order to set elb as an alias record. When I call my application url directly from ELB by his dns it take few ms but when I call my application url over route53 it take 10s!.
I don't uderstand why?

bellow show how is configured on route53 my record
```
myapp.env-dev.aws.domain.com	A	Simple	-	dev-ecs-alb-xxxx.eu-west-1.elb.amazonaws.com.
```
If I call directly **dev-ecs-alb-xxxx.eu-west-1.elb.amazonaws.com** it work correctly but if I call **myapp.env-dev.aws.domain.com** it make 10s to give me a response

Answer

It appears to me your "dev-ecs-alb-xxxx.eu-west-1.elb.amazonaws.com" is a regional endpoint, so when you call the application regionally which means your are close to your application endpoint, is low latency.

Route 53 endpoint is a global endpoint (there are also some other services of AWS are global endpoints), so when you call "myapp.env-dev.aws.domain.co"  - it goes to the global endpoints whicy may take some ms.  That is my understanding. 
Please advise me if you have any other findings.

route53 and ELB latency

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