>Why was it fast enough to run that stuff in the 80s on tiny machines
Lisp Machines were invented precisely because Lisp was slow on common hardware, hence the 8 extra tag bits. Lisp Machines are specialized Lisp hardware.
Lisp Machines were invented precisely because Lisp was slow on common hardware, hence the 8 extra tag bits. Lisp Machines are specialized Lisp hardware.
Still that was not the question. The question was why 1000 times faster computers with much more space should not be able to run Lisp applications when in the 70s it was possible to run a whole OS on tiny machines.
Actually Lisp runtimes perform not worse than the JVM.