kassogtha ~/Code/playground $ cat transducer-bench.scm 
(import transducers
        (rename (only srfi-1 iota)
                (iota list-iota)))

(define xs (list-iota 100000000))

(time
  (transduce
    list-fold
    (compose
      (filter odd?)
      (map (lambda (x) (* 3 x))))
    (collect-list)
    xs))
kassogtha ~/Code/playground $ csc -O3 -static transducer-bench.scm 
kassogtha ~/Code/playground $ ./transducer-bench 
6.505s CPU time, 2.717s GC time (major), 49999999/1 mutations (total/tracked), 1/85516 GCs (major/minor), maximum live heap: 3.35 GiB
kassogtha ~/Code/playground $ cat filter-map-bench.scm 
(import (only srfi-1 iota))

(define xs (iota 100000000))

(define (filter-map pred? mapfunc lst)
  (let loop ((l lst)
             (r '()))
    (if (null? l)
      (reverse r)
      (loop (cdr l)
            (if (pred? (car l))
              (cons (mapfunc (car l)) r)
              r)))))
(time
  (filter-map odd? (lambda (x) (* 3 x)) xs))
kassogtha ~/Code/playground $ csc -O3 -static filter-map-bench.scm 
kassogtha ~/Code/playground $ ./filter-map-bench 
6.076s CPU time, 2.693s GC time (major), 1/58783 GCs (major/minor), maximum live heap: 3.35 GiB

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

kassogtha ~/Code/playground $ cat transducer-bench-2.scm 
(import transducers)

(time
  (transduce range-fold
             (compose
               (filter odd?)
               (map (lambda (x) (* 3 x))))
             (collect-list)
             (iota 100000000)))
kassogtha ~/Code/playground $ csc -O3 -static transducer-bench-2.scm 
kassogtha ~/Code/playground $ ./transducer-bench-2
5.879s CPU time, 1.428s GC time (major), 49999999/1 mutations (total/tracked), 8/109926 GCs (major/minor), maximum live heap: 1.12 GiB