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I just benchmarked the AnalogIn performance on several of my microcontrollers, and the LPCXpresso11U68 board is extremely slow! I measured 176µs for a floating point reading, and 173µs for an 16-bit integer reading. By comparison, the LPC11U24 (which has basically the same peripherals as the LPC11U68) only takes 18µs for a floating point reading, and 14µs for an 16-bit integer reading. Something is clearly amiss here... I've opened an issue over at GitHub, and I've attached my benchmark code and findings in case anyone is interested:
main.cpp