bug#18522: 24.4.50; mapcar is very slow

[Peter Münster]

On Sun, Feb 21 2016, Peter Münster wrote:

> The problem seems to be string-match:

Sorry, I was wrong. The problem seems to be the binding of
case-fold-search:

(defun my-parse-time-string-test ()
  (let (case-fold-search)
    t))

(let ((gc-cons-threshold most-positive-fixnum))
  (benchmark-run 1
    (dotimes (i 100000) (my-parse-time-string-test))))

Fast emacs: (0.054105733 0 0.0)
Slow emacs: (1.754813882 0 0.0)

-- 
           Peter