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Transcend.scm is the sort of file that hobbit can compile; the c code looks reasonable to me, although I am not sure I could tell. Why not just cut and paste it into numbers.c, you will then get full support for complex's with negiligble (sp??) boot time. Another chunk of boot-9 that can easily be frozen in c is the polymorphic posix definitions; even I can translate those by hand into c. They could then go into the posix init function. Finally, I have played round with what I call quick-load. This reads the whole file into a buffer, then evals that; it uses marginally more memory but is typically 20 or 30% faster in the cases I have used it. The extra memory is freed when the file is loaded. I find it hard to imagine that this will ever be a problem. For code that is loaded before the module system is started, it should be an even greater gain. quick-load uses the system level functions (stat, open, read). It will not work on a pipe; in that case you probably have to fall back on the existing load. Is it worth hacking guile to try using quick-load as a default replacement for primitive-load? Julian Satchell <satchell@dera.gov.uk>