Velocita is a caching reverse proxy for Composer repositories and package distribution locations, such as Packagist or GitHub.
Install composer-velocita and point it to https://php-proxy.infra.c-and-u.co:
composer global config allow-plugins.gmta/composer-velocita true
composer global require gmta/composer-velocita
composer velocita:enable https://php-proxy.infra.c-and-u.co
Mirrors for the following locations are configured and active: