Re: slow scrolling
- On Wednesday, May 22, 2013 5:58:26 PM UTC+12, LCD 47 wrote:
> I don't have numbers to back that upWith the new engine, and syntax colouring on, but regexp logging turned off, eval.txt (from the vim help) takes about 25 s for me to scroll from top to bottom, holding down ctrl-F. (This in gvim or vim, lines=60). The old engine takes about 3.5 s. (Keyboard repeat rate set to 50 Hz, 100 ms delay, which is fun, but not reeallly usaablle.)
Using cat *.c > ~/vimcat.c from the vim source directory, again holding down ctrl-F, syntax colouring on, the new engine scrolls 1400 lines per second, and the old 2,800 but is limited by the keyboard repeat rate.
Using a 100 MiB C text file "large.c", LargeFile plugin disabled, and
time ~/vim/src/vim -c '/plain_text_string/p' -c :q large.c
reports 40.7 s, of which about 3.7 s is start up time, so 37 s for the search.
time ~/vim/src/vim -c 'set re=1' -c '/plain_text_string/p' -c :q large.c
reports 7.9 s, again 3.7 s is startup time, so 4.2 s for the search.
Clearly, the new engine is much slower than the old, especially for a simple text search.
Regards, John Little
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