wp mirror, 04/07/2014 23:33:
2.1) Speed: Importation proceeds at less than 0.1 pages/sec. This means that, for the largest wikis (commonswiki, enwiki, wikidatawiki) importation cannot be completed before the `xincr' for the next day is posted.
Did you try https://meta.wikimedia.org/wiki/Data_dumps/ImportDump.php ? https://www.mediawiki.org/wiki/Manual:Performance_tuning is also important, for instance in the last import I tried most time could be saved by setting proper l10n cache (on CDB).
Nemo