We extend the conserved informational throughput framework to signal propagation by identifying the local maximum signal velocity with the throughput field: v = χ(r) · c. Testing this scalar relation against the four classical tests of general relativity reveals that it correctly reproduces gravitational redshift but recovers only half the predicted Shapiro delay and light bending. This factor-of-two deficit is identified as the missing spatial throughput component. We introduce a two-component throughput structure — temporal (χ_t) and spatial (χ_r) — whose product defines the null signal velocity v_null = c · χ_t/χ_r = c(1 − 2κ/r). The extended framework reproduces all four classical tests of general relativity exactly: gravitational redshift, Shapiro delay, light bending, and perihelion precession. Gravity is interpreted throughout as a gradient of informational processing capacity rather than a geometric force.