Citing from Sven Erik Knudsen's contribution to "The Art of Simplicity (see References): "Lilith's clock speed was 7 MHz and enabled the Lilith to execute between 1 and 2 MIPS (M-Code instructions). (...) Initially, the main memory was planned to have 65,536 16-bit words memory, but soon after the first version, it was enlarged to twice that capacity. For regular Modula-2 programs, however, only the initial 65,536 words were usable for storage of variables."
The development of Lilith was influenced by the Xerox Alto from the Xerox PARC (1973) where Wirth worked from 1976 to 1977. Unable to bring back one of the Alto to Europe, Wirth decided to build a new system from scratch
There was also a Soviet clone of the Lilith called Kronos.