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Have you tried regulating down the pressure holding the table down before energizing your cylinder up? This would reduce the amount of air that has to be exhausted before lifting occurs. This could reduce the 5 second lifting delay. It probably won’t have much effect though if your circuit is causing the restriction. Once the cylinder is up it probably has a lot of air to be exhausted. The inrushing air is giving you your initial motion down at which point the exhausting air is being choked due to the circuit restriction. Have you thought about adding a quick exhaust valve on the cylinder to allow the exhausting air to bypass your circuit? Have you tried reducing this pressure? Have you checked into replumbing your valve for double flow and letting gravity do the work on the return? If redesigning your circuit is an option than this article might help.