EC2 Instance has 5 times more latency than AWS console

I have latency (ping) dependent application, so I moved from random hoster name to amazon, because it also hosts my "target" website. When I resolve "target" website name I'm getting ec2-ip_address.ap-northeast-1.compute.amazonaws.com So I chose ap-northeast-1 region, created a bunch of instances (m2.micro) with different subnets (ap-northeast-1a, 1c, 1d) to find greatest location. Later on I also added two different subnets to VPC configuration (ap-northeast-1-wl1-kix-wlz-1, ap-northeast-1-wl1-nrt-wlz-1), retested everything and tried to use them also in EC2 instance but faced "Instance launch failed. The requested configuration is currently not supported. Please check the documentation for supported configurations." without specifying what exactly is wrong or unsupported.

Testing technique: Plain python requests.get() with measuring request start and responce recieve time. Without any additional load on the system

Numbers:

Previous hosting, 2 core vps, ubuntu 22.04, no OS optimizations: website1.com 0.04753 website2.com 0.14008

EC2 Instance m2.micro (any subnet), ubuntu 22.04, no OS optimizations: website1.com 0.09059 - 2x slower than previous hosting website2.com 0.13937 - same as previous hosting Numbers were exactly the same between ap-northeast-1a, 1c, 1d

AWS CloudShell: website1.com 0.01976 - 4-5 times lower latency than any of EC2 instances while also 2-3x faster than previous hosting! website2.com 0.06534 - 2-3 times lower latency than any of EC2 instances while aslo 2-3x faster than previuos hosting!

So the question is how do I get AWS CloudShell latencies on my EC2 instance?