Most of the NXP information comes derived from the ARM web site. ARM as a core provider does a lot of simulations and testing of their cores... then it's up to the MFG (NXP in this case) to carefully and smartly bind the cores and peripherals together on silicon and manage the timing a propagation issues etc.

As the LPC1100 is an M0 core (a smaller version of the Cortex -M3)
I imagine NXP will do some bench mark testing of the LPC1100 as they have done with the LPC1300.

Oh... here's some bench marks.
http://www.standardics.nxp.com/support/microcontrollers/arm.techcon3/

Joe