Your bug report

#20154: 25.0.50; json-encode-string is too slow for large strings

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 20154@debbugs.gnu.org.

-- 
20154: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20154
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems