If you encounter problem with your website. You can use below 3rd party test tools to see whether issue is caused by your hosting provider or your local internet provider.
Website Speed Test by Pingdom (support multiple locations test) - https://tools.pingdom.com/
GTmetrix (support multiple locations test) - https://gtmetrix.com/
Or traditional way via ping command or using 3rd party ping site.
CA App Synthetic Monitor - https://asm.ca.com/en/ping.php