is this a new truck?
i've found generally when the trucks come from the factory they tend to have the speeds set slower than most folks like. I usually wind up changing the flow in the auxiliary hyd circuit so that the tilt and SS will go faster. You don't want to make it too fast because it will heat up the oil too fast and overheat the oil and/or hydraulic motor/pump.
The main relief valve pressure should be 2800psi and the auxiliary pressure should be 2250psi.
You'll need to put a tee fitting inline with the main hydraulic pressure hose to install a 5000psi guage and take the main pressure reading. If it needs adjustment the relief valve should be located on the main housing where the lift lever connects. As for the auxiliary hydraulic pressure the adjustment for that is on the tilt section. Both adjustment screws are an allen hex and may have a lock nut on them.
This is what i've usually found that causes the slow auxiliary speed.
If by chance it is a speed setting in the software first i would check the different mode settings, each one has different characteristics between the drive and hydraulic speeds mode 1 being the most conservative and mode 4 being the most aggressive. You might want to try this first before you do anything.
I believe the only way you will be able to change the mode characteristics is with pc service tool. You can also do it with a handset but that is more difficult, you'll need the full spec sheet including all the settings for the modes for that truck/controller, but it can be done.