Why playoff lines move slower than regular season lines.
A regular season NBA line opens at noon, drifts a half point through the afternoon as the public reads injury news, and settles into its closing range about 90 minutes before tip. Playoff lines do not behave that way. They open earlier, move less, and close almost exactly where the smartest opening number landed.
This is not a quirk. It is the market behaving more efficiently because the conditions that create regular-season inefficiency are mostly absent.
What changes between April and May.
Three structural shifts compress the market.
Higher handle per game.
A regular-season Tuesday night Pelicans game might handle one one-hundredth of what a Game 4 handles. With more total money flowing in, the market reaches its true price faster. Public-side noise that distorts a regular-season number gets absorbed quickly when sharp money is also pouring in.
Less injury uncertainty.
Regular-season lines often move two or three times in the hours before a game as players are scratched or upgraded. Playoff teams shrink rotations, lock in their core, and announce status earlier. There is less news to react to.
More analyst attention.
Every playoff game gets dissected publicly by dozens of analytics writers and beat reporters. The information that a sharp had to dig for in February is on Twitter by the morning of Game 3. Books incorporate that information into the opener.
The combined effect is a market that opens closer to its closing number than it does in the regular season, and stays there.
What this means for getting a number.
In the regular season, you can often wait for a better price. In the playoffs, you usually cannot. If the model fires a signal at <span class="stat">+4.5</span>, the closing line will probably be within a half point of that number. The window to get the price is narrow.
Steam moves still happen, and they mean more.
When a playoff line does move two or more points in a short window, that move is meaningful. In the regular season, a 2-point swing might be a single sharp group hitting the market. In the playoffs, it is more likely an injury announcement, a rotation change, or a late piece of information that will be in the public discourse within an hour.
The model treats playoff line moves as more informative than regular-season moves of the same size. A game that opens <span class="stat">-6</span> and closes <span class="stat">-8</span> in the playoffs has had something material happen.
How we use it.
The NBA model's playoff mode raises the edge threshold for signals because the market is harder to beat. Fewer signals fire per game. The signals that do fire tend to come earlier in the day, before the closing window has fully compressed, and tend to live in less-watched markets like first-half lines and team totals where the efficiency advantage of the closing market has not yet been fully applied.