Webpage is loading slow

There are several potential reasons why your website on AWS Lightsail is loading slowly, both when accessed via IP address and domain name. Here are some steps you can take to troubleshoot and potentially resolve the issue:

1. Check your Lightsail instance configuration: Ensure that your instance has sufficient resources (CPU, RAM) to handle the website traffic. You may need to upgrade to a larger instance type if your current one is overloaded.

2. Verify DNS configuration: Since you're using Cloudflare to manage your domain, make sure that the DNS records are correctly pointing to your Lightsail instance's IP address. Incorrect DNS configuration can cause slow loading times.

3. Review Cloudflare settings: Cloudflare offers various performance optimization features. Ensure that you have enabled appropriate settings like caching and minification to improve load times.

4. Optimize your website: Look into ways to optimize your website's code, images, and other assets to reduce load times. This includes minimizing HTTP requests, compressing images, and leveraging browser caching.

5. Check your web server configuration: Ensure that your web server (e.g., Apache or Nginx) is properly configured for optimal performance. This may include enabling compression, adjusting worker processes, and fine-tuning caching settings.

6. Monitor server logs: Review your web server logs to identify any errors or bottlenecks that might be causing slow load times.

7. Consider using a content delivery network (CDN): If your audience is geographically dispersed, using a CDN can help reduce latency and improve load times.

8. Test from different locations and devices: Use online tools to test your website's performance from various geographic locations and devices to identify if the issue is specific to certain regions or configurations.

If you've gone through these steps and are still experiencing slow load times, you may want to contact AWS Lightsail support for further assistance. They can help you identify any potential configuration problems or performance bottlenecks specific to your Lightsail setup.
Sources
DNS issues. Loads by IP not Name. | AWS re:Post
Domain assigned to Lightsail instance | AWS re:Post
Unable to start/load apache2 on LightSail LAMP configuration | AWS re:Post

Did you try to open the webpage directly through ip of Lightsail? How was the loading speed? Maybe the issue is with the lightsail instance configuration itself? how heavy is your webpage? There are so many scenarios mentioned above that you should look into before coming to any conclusion.