Because Common Lisp images can be quite large, the NESL executable (runnesl) may require a comparatively large amount of space: between 3 and 35 Megabytes (the exact amount depends on which version of Common Lisp you are using, and can be as big as 35 Megabytes for Lucid Common Lisp). If this is too much space for your liking, then the variable *nesl-path* should be set in the file neslsrc/load.lisp, and the user should start up Common Lisp and load neslsrc/load.lisp each time they want to run NESL. This will load in the compiled files and be much faster than doing a build, but not as fast as starting up a dumped executable.