What needs to be done to check the website loading speed in different regions of the world?

1. Use online services to test download speed. These services (e.g., GTmetrix, Pingdom Tools, WebPageTest) allow selecting a testing location and provide detailed performance reports.
2. Deploy a test environment in various regions. This involves using cloud platforms (AWS, Google Cloud, Azure) to create virtual machines or containers in target regions and run tests directly from these locations.
3. Use CDN (Content Delivery Network). Not just a testing method, but a solution that affects download speed in different regions. Testing with CDN will show real performance for users.
4. Emulate different connection types and devices. Some services and tools allow simulating low internet speed or mobile devices, which is important for a complete picture.
5. Analyze performance metrics. Key indicators include First Contentful Paint (FCP), Largest Contentful Paint (LCP), Time to Interactive (TTI), Total Blocking Time (TBT), and Cumulative Layout Shift (CLS).
6. Real-time monitoring. Using website performance monitoring tools (APM) allows collecting data on download speed from real users in different geographic points.

Example of using an online service:

// Typical steps when using a service like WebPageTest
// 1. Go to the WebPageTest website.
// 2. Enter the URL of the site to test.
// 3. Choose a testing location (e.g., London, UK).
// 4. Select browser type and connection speed.
// 5. Run the test and analyze results (waterfall diagram, metrics).

Example of deploying a test environment on AWS:

# Typical steps for deploying a VM in another region on AWS
# 1. Log into the AWS console.
# 2. Select the region (e.g., eu-central-1 for Germany).
# 3. Launch a new EC2 instance (virtual machine).
# 4. Install necessary testing tools (e.g., Selenium, Puppeteer).
# 5. Write or run scripts to measure download speed.

It is important to conduct testing from regions most relevant to the target audience.