[Bug 57773] performance problems when using scopeless optional attributes

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=57773

--- Comment #8 from Bernhard Frauendienst <ap...@nospam.obeliks.de> ---
This issue hit us quite hard when trying to upgrade from 8.0.15. An optional
attribute in a very frequently used tag caused performance to drop massively 
(especially combined with the default non-parallel WebappClassLoader).

Even though I finally found the root of the problem, it seems very hard to
contain. Any developer could easily trigger the issue, and might decrease
performance slowly one step at a time, without even noticing, yet causing a
massive performance hit in the long run.

I understand that the situation is tricky due to spec requirements, but any
solution to make this behaviour more controllable would be most welcome.

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