Hi, in the latest guile-json, 4.1.0. I changed some code to use for-each+string->list. The performance seemed nice and I released it.
Christopher Lam pointed out that I could have used string-for-each instead. I made the change but the performance degraded a lot: string-for-each: scheme@(json parser)> ,t (->bool (scm->json-string json)) $19 = #t ;; 17.909537s real time, 18.063382s run time. 0.207281s spent in GC. vs for-each + string->list: scheme@(json parser)> ,t (->bool (scm->json-string json)) $20 = #t ;; 2.998381s real time, 3.319349s run time. 0.471969s spent in GC. string-for-each is implemented in scheme here, if Im not wrong: http://git.savannah.gnu.org/cgit/guile.git/tree/module/rnrs/base.scm#n89 string->list and for-each would use C. Is that huge gap expected? This is with Guile 3.0.2. Best, Aleix
