Are you using the CY8CKIT-059?
Seven pins on that board have capacitors connected to them: P0[2,3,4], P3, P15[2,3,4]
odissey1 made a nice annotation kit that also serves as a handy reference if this is the problem.
The rise/fall time on digital pins should be in ns range. Take look at this video
It also depends on the bandwidth of the scope and quality of the probe. On 100 MHz Tek scope equipjed with cheap $10 probes I see >100ns risetime. Same scope with homemade 1/20 probe shows ~10ns risetime. Google how to make own probe with 1k resistor for fast signal fronts
Other simple steps is to add a load resistor to the pin (~1k) and switch probe to x10.