how can I improve the bandwidth?

To check and improve the bandwidth on your EC2 instance, you can follow these steps:

1. Check current bandwidth:

   • Use CloudWatch metrics to monitor your instance's NetworkIn and NetworkOut. This will help diagnose network bandwidth issues.
   • You can also use the AWS CLI or PowerShell to obtain network performance information for your EC2 instance type.

2. Improve bandwidth:

   • Enable enhanced networking if it's available for your instance type. This can increase network bandwidth, packet-per-second performance, and lower latency.
   • If you're using instances with at least 32 vCPUs, you can utilize up to half of the network bandwidth available to the instance for multi-flow traffic to the internet.
   • For single-flow traffic, consider using a cluster placement group to achieve up to 10 Gbps bandwidth for instances within the same group.
   • Set up multiple paths between two endpoints using Multipath TCP (MPTCP) to achieve higher bandwidth.
   • If your instances are in the same Availability Zone and are eligible, configure ENA Express to achieve up to 25 Gbps between those instances.

3. Optimize instance settings:

   • For Linux instances, update the MTU, increase the Rx ring size, and configure TCP queue limits for optimal performance.
   • Set the TCP small queue limit to 1MB or higher to increase the amount of data queued for transmission on a socket.
   • Disable byte queue limits on the eth device if they're enabled for your Linux distribution.

4. Check for external factors:

   • If users are experiencing slow loading times, verify if they are behind a firewall. Some firewalls may have bandwidth limitations or smart queuing that affects inbound traffic.
   • Consider using a VPN to bypass potential network restrictions.

If you're still experiencing slow image loading times after implementing these improvements, you may want to consider other factors such as image optimization, content delivery networks (CDNs), or scaling your infrastructure to handle increased load.
Sources
Troubleshoot slow EC2 Windows instance performance | AWS re:Post | AWS re:Post
How do I determine internet bandwidth that is allowed for EC2 instance ? | AWS re:Post
Amazon EC2 instance network bandwidth - Amazon Elastic Compute Cloud
Slow download speed on client side, could not find the reason. | AWS re:Post
Improve network performance between EC2 instances with ENA Express - Amazon Elastic Compute Cloud