Browsers can simulate that without a proxy too: https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/throttling/index.html https://firefox-sour

Browsers can simulate that without a proxy too: https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/throttling/index.html https://firefox-source-docs.mozilla.org/devtools-user/networ... Chrome can also throttle the CPU power: https://www.wikihow.com/Throttle-Your-Browser-for-Testing https://www.wikihow.com/Throttle-Your-Browser-for-Testing