It can be either, and the fastest way to diagnose is to separate “power delivery” from “mechanical movement.” First, verify the actuator’s input: correct voltage and stable power for electromagnetic release, correct hydraulic/air pressure and flow for fluid systems, and correct VFD/control timing for electro-hydraulic thrusters. If input is low or unstable, release will be slow or incomplete.
Next, check the actuator’s output: stroke length, thrust/force, and response time compared to the manufacturer’s specification. A thruster with low oil level, internal wear, or cold-viscosity oil may move slowly even with correct power.
Finally, inspect mechanical binding: seized pins, bent linkages, misalignment, corrosion, and incorrect installation geometry can make even a healthy actuator struggle. A simple test is to disconnect the actuator from the linkage (if safe and permitted) to see if the actuator moves freely. Always reassemble and test under controlled conditions. Slow release should be treated seriously because it can cause dragging, overheating, and unsafe operation.