On Tue, Oct 27, 2015 at 9:25 AM, martin rudalics <rudalics@gmx.at> wrote:

> If it looks for whitespace followed by a line end and not
> for whitespace preceding a line end, the old version will be slow with
> indented code.

I don't think we've ever had a bug report / complaint about
delete-trailing-whitespace's performance. It's usually used either
interactively or as a hook before saving the file, and in both cases I'd
bet the time it takes is dwarfed by human reaction times or by the time
spent saving the file to disk.

    J