Aside from all of these people giving you the technically correct answer, I also for a moment wondered if "ibuprofen" was the gimmick name of some wrapper that

Aside from all of these people giving you the technically correct answer, I also for a moment wondered if "ibuprofen" was the gimmick name of some wrapper that sped up doom or made it more playable on the system before I realized the author meant that playing with the slow frame rates would be painful.