Deletion of file takes ~8 seconds. I got numerous reports about that from ru.wikipedia and was able to reproduce that on test.wikipedia as well. Please investigate.
Profiler output (all entries >1%):
<!--
100.00% 7.811909 1 - -total
98.61% 7.702979 1 - MediaWiki::main
96.82% 7.563558 1 - MediaWiki::performRequest
96.66% 7.550731 1 - MediaWiki::performAction
34.97% 2.731953 2 - FileBackendStore::doOperationsInternal
29.91% 2.336342 1 - FileBackendStore::deleteInternal
15.57% 1.216589 1 - FileBackendStore::doClean
13.43% 1.049439 1 - LocalFileDeleteBatch::execute
5.64% 0.440752 1 - AbuseFilterHooks::onArticleDelete 5.63% 0.439517 1 - AbuseFilter::filterAction 5.62% 0.438832 1 - AbuseFilter::checkAllFilters 5.36% 0.418516 3 - LockManager::unlock 3.81% 0.297513 3 - LockManager::lock 3.35% 0.261549 258 - MWMemcached::get 2.23% 0.174238 52 - AbuseFilter::checkConditions 2.22% 0.173525 51 - DatabaseBase::query-master 1.97% 0.153577 11 - Title::getUserPermissionsErrorsInternal 1.95% 0.152442 2 - FileBackendStore::doPrepare 1.75% 0.136925 1 - MediaWiki::finalCleanup 1.70% 0.132838 1 - FileBackendStore::moveInternal 1.68% 0.131577 1 - OutputPage::output 1.52% 0.119060 1 - Output-skin 1.52% 0.118848 1 - SkinTemplate::outputPage 1.51% 0.118343 2 - CentralAuthHooks::onUserGetRights 1.38% 0.108028 46 - AbuseFilterParser::doLevelFunction 1.36% 0.106230 1 - wmfPurgeBackendThumbCache 1.09% 0.085180 5 - User::getEffectiveGroups 1.03% 0.080707 9 - User::load 1.02% 0.079321 1 - FileBackendStore::doSecure
Version: unspecified
Severity: major