Item12313: serious performance impact calling initTOPIC in commonTagsHandler

commonTagsHandler is potentially called quite often on a single topic view, i.e. while rendering results of a formatted search.

Tracing down some strange slowdown of search I've found that this was caused by pushTopicContext called repeatedly by WorkflowPlugin (via commonTagsHandler and initTOPIC). The code tries to find out whether the web.topic passed to initTOPIC is under workflow control or not by reading preference settings.

This operation is rather expensive and sums up to a couple of seconds rendering time on top of the rest of the formatted search.

On my laptop a search rendering a plain list of 1.1k topics came down from 8-9 seconds to 800ms. So that's a serious foul egg in WorkflowPlugin.

-- MichaelDaum - 23 Dec 2012

I changed it to be a bit smarter about when it calls initTOPIC.

-- CrawfordCurrie - 08 Aug 2014

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