It takes a little time to settle in.
Here on the forum we recognize developments in near real time. The "market" has to get through the day, and the evening at home with family, and then start to digest new information. Paid content providers need to promote the news for a lot of people to recognize it. But, within a few days, there's typically a rise in awareness and increase in sp.
One thing I've noticed. We always see it before the investment community does.