The lagging strand.

doesn't change direction until a few quarters after the economy does (unemployment rate)

Lagging means the current is out of phase, lagging behind, the voltage. This occurs when there is inductive reactance in the circuit, such as with motors and transformers.

it is probably lagging because your in a populated place
or your computer is slow and have virus

depends if your lagging or not. if your laggy about 6 or 7 , if your not lagging about 4 secs.