[Zope] Superfast PageTemplates: Call for expertise

[sean.upton@uniontrib.com]

In know this is purely speculation, but what about caching page-templates in
some intermediate format like ESIS, and writing a lexical scanner for the
TALES structure in C/Flex with callbacks to Python for code evaluation and
object traversal?  Obviously, this isn't trivial, but I imagine it would be
interesting...

Sean

-----Original Message-----
From: Dieter Maurer [mailto:dieter@handshake.de]
Sent: Tuesday, February 18, 2003 1:45 PM
To: Peter Bengtsson
Cc: zope@zope.org
Subject: Re: [Zope] Superfast PageTemplates: Call for expertise


Peter Bengtsson wrote at 2003-2-17 22:57 +0000:
 > ...
 > My product uses PageTemplates (mostly through PageTemplateFile) and the 
 > PageTemplate stuff really goes at the top of the CPU timing.
 > I.e. the PageTemplate rendering is "slow". DTML is probably not faster

DTML is much faster...

 > and 
 > I'm not "blaming" PageTemplates as such because I understand that they
have 
 > a lot of work to do.

 > My question is: How do I ease off the load on PageTemplate rendering?
 > 
 > What in TAL should generally be avoided, if possible, to gain that extra 
 > performance?

The slowest part for a PageTemplate is its parsing...

  Avoid doing it more than once.

 > Are there any particular constructions that are "bad" to do with TAL 
 > syntax/formatting?

I do not think so.

 > (I've heard that METAL is "slow" but they're difficult to avoid because
of 
 > their great functionality)

I cannot confirm this.

Someone started to code PageTemplates in C. I think, I read something
about this in the "xml-sig" mailing list.

A little less drastic would be to replace the "HTMLParser"
and use, e.g. "sgmlop".


Dieter

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