fastservice.org
Speed is the differentiator when everything else is comparable, and in most of the businesses people actually choose between, everything else is comparable. Repairs, delivery, food, support, trades, processing, permits.
Fast service names a quality rather than a product, which means it can sit over an entire category instead of one offering. That suits a service marketplace, a dispatch platform, a repair network, a same-day delivery operation, or a rating site measuring how quickly companies really respond.
The .org points somewhere specific and underserved. Public services, community organisations and nonprofits are where slow service does the most damage, and a body working on service standards or response times in that sector would find the name entirely apt.
Two of the most common words in English, joined, no hyphen, nothing to spell out. It also survives translation into a slogan, which most names don’t.
Offers welcome.