From: John Doe on
> Core 2 Quad Q9550, 2.83 GHz
>
> Playing Forged Alliance. When using only one core, the one core
> quickly maxes out and makes the game slow and choppy...Using
> four cores makes it run smoothly

In the attached/corresponding picture is what CPU activity looks
like when the game's CPU load is spread from one core to all
cores, using a tiny utility called "Core Maximizer" made by a fan
of the game. In full screen mode, the game goes from choppy to
smooth. With the game in windowed mode, the entire system
performance goes from slow to fast.
From: John Doe on
Following is another example, playing Supreme Commander 2. The first
pic is starting the game normally using all four cores. The second
pic is starting the game and using Windows Task Manager to jostle the
process priority, toggling core zero off and then back on. Still
using all four cores, just turning core zero off, applying the
change, and then turning core zero back on again.