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

[Dmitry Gutov]

On 03/20/2015 07:44 PM, Eli Zaretskii wrote:

> That's not what I see here.  I cannot get the time above 1 sec even
> with a 1000 time longer input string, if I replace json-encode-char
> with 1+.

What code exactly have you tried? You can't just replace 
json-encode-char with 1+. The former returns a string, the latter 
returns a number (or a char, I guess).

> So I think your 100ms is the constant overhead of some kind.

If you just changed the upper bound in the defvar init form (from 30000 
to something), I suspect you forgot to use C-M-x instead of C-x C-e, to 
update the actual value of the variable.

Making the string 10 times longer increases the runtime by ~5 here (0.1 
-> 0.5). Another 10x increase in length makes it run 4.3 seconds.