Force = weight = Pressure times area of the number of cylinders combined times any multiplier linkage. If it picks it up the pressure is okay (maybe). Speed is about gallons per minute from the pump and the size of the cylinders. Larger cylinders pick up easier(lower pressure) but go slower. Speed equals gallons per minute from the pump divided by 449 and that number divided by the area of both cylinders measured in cylinder area inches squared divided by 144 for a number in ft per second speed. Multiply the ft per socond number by 12 and you get inches per second. You can measure the inches it takes to make a stroke from retracted to extended and time the seconds. If that matches what the numbers say then it is doing what it is supposed to do. You can do the speed measurement unloaded. A positive displacement pump, pumps volume not pressure. The speed doesn't care if you are loaded or not with one exception and that is when you pop the relief valve and the fluid goes to tank and the loader slows down. Small lines can cause pressure drops that can cause the relief valve to relieve and fluid goes to tank and not the cylinders. This occurs when you are close to the max system pressure the relief is set for. Small lines and hoses plus lots of fittings can soak up a 100 psi of pressure drop when moving. So measure the speed unloaded and if it is what you want then you are probably exceeding the pressure capacity of the system when loaded and your speed fluid is going to tank because the relief is doing its job. The pump volume is proportional to the rpm it is turned at. This means more throttle which increases rpm on the pump means more gallons per minute which means more speed as long as the relief is not relieving. It takes a higher pressure to accelerate a load than it does to pick it up slowly. Hope this helps.
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