Yes, the 700P task program opens with little to no lag time even with the 1600 completed tasks. Before I tried the 700wx, I never had to pay attention to the number of completed tasks as it was not an issue with the 700P. I would describe accessing applications on the 700P as "lightning-quick" in comparison to the 700wx. I will say that I thought the 700wx was fast when I tested the store model; however, there was hardly any data in the applications.
Thanks again for this valuable info. Outside of this GTD lunatic fringe, where else can you find out how a smartphone works with 1600 tasks?