Grüner_Gimpel wrote:
> I noticed that using Vim 7.4a the Vimwiki plugin works measurably
> slower with re=0 than with re=1. I figured out the reason is this
> regexp in the syntax definition:
>
>
> [[:alnum:]]\@<!\%(\%(\%(http\|https\|file\|ftp\|gopher\|telnet\|nntp\|ldap\|rsync\|imap\|pop\|irc\|ircs\|cvs\|svn\|svn+ssh\|git\|ssh\|fish\|sftp\):\%(\/\/\)\)\|\%(mailto\|news\|xmpp\|sip\|sips\|doi\|urn\|tel\):\)\S\{-1,}\%(([^
> \t()]*)\)\=\S*
>
> You may know what it is supposed to match.
> Removing some of the branches makes it faster and so does removing
> [[:alnum:]]\@<!
>
> I don't know if there is a standard method for measuring speed of the
> syntax highlight, but here is what I have done:
> - open a relatively large file
> - :set syn=off
> - :syntax match Number
> /[[:alnum:]]\@<!\%(\%(\%(http\|https\|file\|ftp\|gopher\|telnet\|nntp\|ldap\|rsync\|imap\|pop\|irc\|ircs\|cvs\|svn\|svn+ssh\|git\|ssh\|fish\|sftp\):\%(\/\/\)\)\|\%(mailto\|news\|xmpp\|sip\|sips\|doi\|urn\|tel\):\)\S\{-1,}\%(([^
> \t()]*)\)\=\S*/
> - scroll with <c-e> and <c-y>
> - extremely slow with re=0 but normal slow (*wink*) with re=1
>
> So, can this behavior be considered as a bug?
The main problem is the [[:alnum:]]\@<! item. Have you tried adding a
limit? Should be [[:alnum:]]\@1<!
Or perhaps using \< instead will work.
For measuring times: use :syntime.
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