It's clearly the new Ragel Radius parser:
https://github.com/radiant/radiant/issues/247#issuecomment-1578856

On Jul 13, 2:28 pm, Johannes Fahrenkrug <[email protected]> wrote:
> Jim,
>
> if you can point me in the right direction I can look at this myself,
> too.
>
> Cheers,
>
> Johannes
>
> On Jul 11, 2:31 pm, Johannes Fahrenkrug <[email protected]> wrote:
>
>
>
>
>
>
>
> > No problem, I hope it helps! I just tried it with 1.0RC2: Same thing.
> > 460k take almost 10 seconds to render.
>
> > On Jul 11, 2:23 pm, Jim Gay <[email protected]> wrote:
>
> > > Wow. Thanks so much for putting this together.
>
> > > On Mon, Jul 11, 2011 at 7:43 AM, Johannes Fahrenkrug
>
> > > <[email protected]> wrote:
> > > > Hi Jim,
>
> > > > I have created both a 0.8.1 and 0.9.1 demo project that showcases the
> > > > significant performance 
> > > > decline:https://github.com/jfahrenkrug/Radiant-Performance-Decline
>
> > > > Rendering 460k of plain text with Radiant 0.8.1 takes 32ms. Rendering
> > > > the same text with Radiant 0.9.1 takes 9400ms(!!!).
>
> > > > I hope this project helps you to find the bottleneck.
>
> > > > Thanks and cheers,
>
> > > > Johannes
>
> > > > On Jul 7, 12:11 pm, Johannes Fahrenkrug <[email protected]> wrote:
> > > >> Hi Jim,
>
> > > >> thanks for your reply. It's a client project, so I have to see what
> > > >> information I can give out. I have the feeling Radius got slower.
>
> > > >> I'll report back.
>
> > > >> - Johannes
>
> > > >> On Jul 5, 3:27 pm, Jim Gay <[email protected]> wrote:
>
> > > >> > I've not seen this. Can you post some stats and some code to help 
> > > >> > figure it out?
>
> > > >> > Perhaps there were changes that only affect performance in a 
> > > >> > situation
> > > >> > like that of your site (however it is setup) and we're finding the
> > > >> > edge.
>
> > > >> > On Mon, Jul 4, 2011 at 11:16 AM, Johannes Fahrenkrug
>
> > > >> > <[email protected]> wrote:
> > > >> > > Hi,
>
> > > >> > > we have a big site running on Radiant 0.8.2. Internally we're 
> > > >> > > moving
> > > >> > > the site to Radiant 0.9.1. That worked nicely, but most pages need
> > > >> > > about 1 sec (!) longer to render. Most pages have lots of parts and
> > > >> > > snippets.
>
> > > >> > > Are there any known changes from 0.8 to 0.9 that would explain this
> > > >> > > performance impact?
>
> > > >> > > Thanks and cheers,
>
> > > >> > > Johannes
>
> > > >> > --
> > > >> > Jim Gay
> > > >> > Saturn Flyer LLChttp://www.saturnflyer.com
> > > >> > 571-403-0338
>
> > > --
> > > Jim Gay
> > > Saturn Flyer LLChttp://www.saturnflyer.com
> > > 571-403-0338

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