Re: vim-7.4.389 UI extremely sluggish with custom syntax highlighting plugins

David Barnett wrote:

> Yep, it's still slow with "-u NONE -N". It seems to vary quite a bit from
> file to file. The way I reproduce is to just hold down PgDn for a few
> seconds. It's fine for unaffected versions, but stutters for about half a
> second in 362. For some reason most vim files aren't too bad for it.
> src/options.c hangs for about a second for me a few screens down.
>
> Dominique, for some reason the problematic match doesn't even show up in
> ":syntime report". Looks like a useful troubleshooting tool in general,
> though.
>
> David

Hi David

I can now reproduce the slow rendering you
describe with:

$ cd vim/src
$ vim -u NONE option.c \
-c 'syntax on' +471 \
-c "hi def link RightMargin Error|exec ('match RightMargin /\%<42v.\%>41v/')"

Then I press CTRL-F and CTRL-B to scroll forward
and backward by page around line 471. Rendering
is slow with vim-7.4.400. Rendering is much faster
with vim-7.4. When I find time, I'll compare profiling
results before & after vim-7.4.389 (allegedly the patch
that introduces the slow down).

Regards
Dominique

PS: please bottom post in this mailing list.

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