performance sorting by date field (zend framework lucene [php])

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performance sorting by date field (zend framework lucene [php])

svenk
hi,

i have indexed about 9000 documents and i want to sort by a specific date descending.
if i query $index->find('firstname: "sven"', 'updated', SORT_REGULAR, SORT_DESC) it response very slow (about 7 seconds).

i just tried scott-123's recommendation, splitting up the datefield and sort each (http://www.nabble.com/performance-of-sorting-by-date-tf4393670.html#a12527779) without success, response is still slow.

(how) can i increase the sort performance?

Thanks.