Does ec2 have good latency?

For keeping a website with significant traffic, how good is the latency on开发者_运维知识库 Amazon EC2?

I have heard that it is slow for websites and web apps. Is this true?

In my experience it can be slow and it does vary considerably even between sequential requests in quick succession.

If by latency you mean delays in processing browser requests it's likely that the instance the web server is running on is under powered.

I run VoIP apps on EC2 and the latency on those is fine, users kick and scream a lot more if their phone calls are delayed than they do if their web is slow. I did have to switch from an m1.small to a c1.medium intance type recently when things did start slowing down a bit.