Try this file: 
https://raw.github.com/jeremywohl/iphone-scripts/master/appstore_reviews

copy paste it into a .rb file. This feel very slow to me.
I can watch Vim drawing blocks of lines. Using regexpengine=1 everything
is as fast as ever.

patches:  1-1115

It might make sense to introduce little benchmarking for regular
expressions. Eg open such a file, then list which regex took how much
cpu cycles or time.

Bram: You've collected a lot of files for checking. Can you commit them
all to the vim repository, so that we also can implement a simple
benchmark which does
- syn on | syn off  100 times?

That would be enough to find that big regressions. Editing ruby this way
is unbearable (sry).

If we know that some use cases are slower - how to cope with it?
Is the new engine not "ready enough" for such reports yet?
If it should be, what about introducing bencharking regular expressions?
add cpu cycle counter and dump them on exit? Then you'd at least know
for which expressions (ruby case) to select the old engine.

Its not a problem that the new engine is not ready yet, but we should
find a way to cope with it - and introduce ways to find regriessions
fast.

>From now on I've set regexpengine=1 in my .vimrc, too.

Marc Weber

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