The description of change in ITIL does not include fast. It talks about cost-effective and minimum risk, which both implies a bit of slowness. So one of the questions the business have to answer is their prioritization. Fast, with a higher risk or slower with a less risk. If you want both, you need probably need to do major changes to your IT infrastructure, neither cheap or risk free.

Source: Why are changes to IT so slow? — Disruptive architecture