Hell is the bottomless realm that devils occupy, which exists alongside the material world of humans. This realm is further broken up into infinite mini-realms, each with their own type of devils, as well as souls of damned humans that have descended to that particular realm corresponding to their sins. Living humans can make pacts with devils by summoning them from their realm to the material world. This is done through an ancient ritual involving transmutation circles, which serve as a "landing pad" for the devil to enter into. The creature cannot pass the barrier of the circle, which exists as a temporal pocket dimension within its own mini-reality, keeping the human safe from the devil on the other side. There, a human can bargain with the creature, asking for their heart's desire in exchange for services. This system of dealmaking has survived for many millennia, with mages and devils working together to fulfill basic wants and needs. The purpose of this for the denizens of hell is to make deals with humans in order to gain as many souls as possible for their particular realm. A consistent stream of souls to torture provides fuel and power for their realm, allowing those denizens to become stronger. Souls can also be used to barter with other realms as a form of currency. Therefore, devils are incentivized to spread their services far and wide as quickly as they can. Lately however, the system has ironically begun to cause many deficiencies to take root, hurting business overall.
This is mostly due to magic becoming more cosmopolitan in recent generations. In the old days, magic was localized and in the hands of relatively few mages, with only a handful willing to barter with devils. Thus, pacts were only made a few times a year. With the knowledge of magic being spread much more widely today, everyone and their mother wants to sell their soul to a devil in exchange for a luxurious lifestyle. Humans are covetous and greedy, desiring to gain money and power in the easiest and fastest way possible. Denizens of Wall Street, such as hedge fund managers and bankers, are frequent customers of pacts, making their souls some of the most prized among devils. This has led to an economic boom within hell, increasing output tenfold. However, the amount of business has led to a slowdown in response time, making it more difficult for devils to respond to a summoning. When the spell is activated, it can take years or even decades for a devil to cross the border into the material world to even take the request. By then, the original casters have long since died or have moved on, denying the devil the opportunity to make a pact and claim a soul.
With Wi-Fi, everyone in the vicinity can get access to the internet, with service potentially slowing down depending on the amount of people on a particular network at one particular moment. However, this shouldn't be a factor because hell is an infinite place with an infinite amount of denizens eager to be at a human's beck and call. Summonings are happening all across the world in different timezones, calling on devils in various realms. Certainly there should be no lag in service such as what is occurring now. How can this be the case?