When performing a search over all folders with a search term that has several words in it, there are a couple of problems: 1) it seems that these words are searched for in an "OR" manner, yielding way too many results 2) probably because of that, memory usages spikes 3) The memory is not freed after closing the search dialog, resulting in huge memory consumption after a couple of searches. Reproducible: Always tested both from within kontact and kmail only.
still valid
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It seems to be still valid, although the memory consumption isn't as bad anymore (around 700MB after a search, and doesn't seem to be rising after multiple searches any more)