The 150 ohm resistance is always in the path between the op amps, thus it is the ohmic portion of the load.
As for capacitors, they present zero resistance for a brief time after a change in current flow. The definition of capacitance is that it impedes a change in voltage.
An op amp output has internal resistance. There may be a certain value of resistor at the output however there are also the output transistors. They change their own impedance, so as to create a certain voltage at the output. They need to set a certain current level, either sourcing or sinking current.
The speed at which your capacitors respond depends on the unseen and unknown resistance in your op amps.