$ echo "(defclass foo () ())" | time sbcl
This is SBCL 1.2.3.debian, an implementation of ANSI Common Lisp.
...
* 
#<STANDARD-CLASS FOO>
* 0.00user 0.00system 0:00.00elapsed 140%CPU (0avgtext+0avgdata 32360maxresident)k
0inputs+0outputs (0major+901minor)pagefaults 0swaps