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T103117 Performance regression since ae1d0da5875fb61581f61449350634ab1a05604a
T71492 Edits which hit the condition limit should be tagged
T102992 Review WikidataQuality DB schema
T100714 Make redis/redisdb roles support multiple instances on the same servers
chasemp
T101348 GlobalUserPageHooks::onTitleIsAlwaysKnown notably slows down Title::isKnown() calls
T102578 Don't trash cache for front-end resources after each deployment (tracking)
T102793 Bash tools with histograms, trends, and "field" tool should be available to all users on fluorine
ori
T102199 Reports of a high number of edits being rejected due to loss of session data
T102532 revision page_user_timestamp index problematic on large wikis
Springle
T102410 Remove — at least increase — the "template expansion depth limit"
T101433 Use APC for caching slave lag times
T101297 Performance Team Offsite Support
Rfarrand
T100872 Investigate high revision text fetching memcached traffic for key modules
T100706 Revamp anti-spamming strategies and improve UX
T100619 Investigate loading GlobalCssJs from the current wiki's load.php (instead of the central wikis)
T100546 Reduce amount of metadata embedded in thumbnails across site
T100378 ext.imageMetrics.head shouldn't be loaded on mobile
T100377 RSS feeds should not be in head for mobile
T100372 CentralNotice mobile modules should not be loaded in the head
T100262 API requests should be cached
T100258 Only load the lead section on page load
T100255 [EPIC] Load ResourceLoader startup module from the bottom of the HTML
T100254 Spike: Document all uses of jQuery
T100132 Load edit modules only when clicked on edit
T100127 Profiler text output no longer shows
T99829 Exclude (or make it possible to exclude) SQL query profiling from xhprof output
aaron
T97797 ApiQueryAllPages is slow on langlinks edgecase
T99755 Use Hack's curl_mutli_await() in Elastica extension
T99740 Experiment with plain .php files for l10n cache instead of CDB
T99525 HHVM 3.6 leaks memory
ori
T98986 [EPIC] Make mobile web more performant.
T98125 performance: MobileFrontend SearchApi.js query can drop list=prefixsearch and use index to sort
T98124 Deserializers should not store serialization in private properties
T97868 edit/cancel with many existing sitelinks is too slow
T36812 Allow minification of SVG files
T97414 Use an own load section for Wikibase DB queries
T87425 Slow execution on PHP >= 5.6.3 on Windows 7
T97368 Investigate about more efficient PropertyInfoStore implementations
T97206 RFC: Re-evaluate varnish-level request-restart behavior on 5xx
BBlack
T97204 RFC: Request timeouts and retries
T97192 Support lowering the API request timeout per request
T97126 Investigate label prefetching for entities referred to (solely) in revision comments
T75960 Implement file usage limits in parsing
T97099 Squeeze value out of external monitoring services
T97097 Set up alerts for anomalies in key performance metrics
T97096 API requests are not cached for logged-in users unless uselang is set explicitly
T97088 performance.wikimedia.org: define and explain metrics
T96820 firstPaint regression
T96020 Lazy initialize LanguageFallbackChain in LinkBeginHookHandler
T95152 Remove render-blocking JavaScript
ori
T95567 Preload sitelinks based on usage tracking data
T94752 [EPIC] Continuously measure mobile site speed
T95356 Add event tracking queue to MediaWiki core for loose coupling with EventLogging or other interested consumers
T95123 Package or import PageSpeed module (mod_pagespeed)
ori
T93054 Usage tracking: optimize page purges based on sitelink groups.
T93142 Look into Wikibase use of memcached to see what needs broadcasted purges
T88758 Can Commons support a mass upload of 14 million files (1.5 TB)?
T93556 Unit tests using database are slower than needed
T92977 Implement Unique Clients report on cluster using x-analytics header & last access date {bear} [13 pts]
madhuvishy
T92864 Investigate the use of DNS prefetching for reducing page load time.
T85840 Add a wikitext keyword that controls whether animated GIFs are moving or still by default
T92393 SpecialPageFactory::getAliasListObject is really slow (~700ms)
T91535 Performance issues with tags
Cenarium
T91659 MobileFrontendHooks::onResourceLoaderTestModules is really slow
T91198 Investigate variance in load.php response times (www.webpagetest.org)
T91196 Reduce calls to Special:CentralAutoLogin/checkLoggedIn
T45250 Special:RecordImpression should die in a fire
T90975 Session: Help make Wikipedia fast without leaving your browser
ori
T90706 Benchmark deferred entity deserialization
T90707 Implement deferred deserialization of Entity
T47532 Add file-based cached implementation of SiteStore
T90098 Special:EntitiesWithoutLabel shouldn't use numerical offsets
T89010 Links don't get created fast enough (creates an internal link to selected text rather than an external link to URL pasted)
T89965 When sitelinks change, update link data in cached ParserOutput without re-parsing the page.
T84838 Slow rendering pages display content outside the container
T89775 Performance: Investigate using core-js instead of es6-shim
T89669 Consider using https://github.com/lipis/flag-icon-css for flag icons
T89625 Removing characters causes re-rendering of paragraph (causing spell-check to flicker)
T89623 Pasting content results in scroll flickering
T89550 MessageBlobStore::clear queries take 40+ seconds
T87266 Parsoid endlessly running on certain pages
T88915 Slow parsing / huge pages from HTML dump error logs: timeouts, crashers
T75412 Title timing out
T74564 Parsoid extremely slow to render a short article
T61840 jsdiff uses excessive time / memory on pages with a lot of lines
T53272 Performance: Investigate HTTP client connection pooling and HTTP pipelining
T51374 Parsoid runs out of memory when parsing 'User_talk:Trekphiler/Archive_6'
T88654 UX and performance issues with mediawiki.page.gallery module
T88644 Implement batch lookups of globaluserpage existence when changing link colors
T88594 Consider overriding $.fn.show / $.fn.hide
T88589 "Use of "wgUserLanguage" is deprecated. Use mw.config instead." in AnonymousI18n gadget
T88535 Investigate preconditions & constraints for using Elastic directly
T88534 Implement EntitySearch service on top of Elastic
T88170 Overall performance review of Popups/Hovercards extension
ori
T87553 Performance issue in HHVM with output buffer?
T87184 Establish a user testing framework for perceived speed
T86666 HTTPS performance tuning
T75951 Properly abort MediaViewer preload requests
T45888 Batch Parsoid's API requests
T86609 Collect more data in MediaViewer network performance logging
T86530 Tracking: replace wb_terms table with more specialized mechanisms for terms
T42812 jquery.makeCollapsible: Refactor to use CSS instead of JavaScript to do the expansion/collapse (including initial state)
T86104 Make MediaViewer faster
T85841 apimethods gdash is broken: Shows "No data"
T85796 Consider switching to TextMate-based language grammars
T85794 SyntaxHighlight_Geshi extension should not register 250+ modules for stylesheets
T76148 Compress OOjs UI PNGs with pngcrush -brute -reduce
Jdforrester-WMF
T85737 Optimize Wikidata's Composer class loader impact
T57192 Repetitive API userinfo queries
T85499 wbEntity shouldn't be served on every page load
T85415 limit prefix match queries of table wb_terms to more than 3 chars
Wikidata-bugs
T78266 Implement Entity::copy more efficiently
T76394 batch label lookups for onLinkBegin hook handling
T76393 do batch label lookups for Special:Contributions, via ContribsPager::reallyDoQuery hook
T75684 Use batching label lookup in SpecialWikibaseQueryPage
T75485 benchmark new data model implementation in php
T62341 Load widgets on demand
T85244 Evaluate TAssembly for UI messages
T85004 Use CSS instead of jQuery for wb-claim-name position animation
T78621 Generate mobile specific flame graphs
T78413 Performance issues in Internet Explorer 11
T78157 Implement label prefix search based on Elastic (resp Cirrus, Lucene)
T78156 Cache wbsearchentities responses for short prefixes
T78149 Prevent events from bubbling up the whole DOM unnecessarily
T28605 Use strtr instead of str_replace when possible
T66214 Use content hash based image / thumb URLs
T76677 Performance tweaks based on profiler
aaron
T78046 Implement a single math rendering mode that works across all devices (MathML / SVG using mathoid)
T76938 Special:AncientPages times out on translatewiki.net
T57889 Improve support for asynchronous requests (saving/preloading pages)
T76159 Preload labels and descriptions for Lua and the parser function based on usage tracking data
T76156 mw.wikibase: Use __index to lazy load entity contents
T75460 Sane Lua label access in non-content languages
T76706 Design caching infrastructure for SiteStore
T76705 SiteStore / SiteList performance and caching (tracking)
T75087 Efficient entity label lookup (tracking)
T58602 avoid fetching SiteList object from memcached
T50172 VisualEditor: Throttle or otherwise handle large copy-paste input
T76544 Explore performance gains from progressive (JIT?) de-alienation of content types in VisualEditor
T76543 Provide server-side change staging so that saving is near-instant
T76542 Explore using SurfaceFragments to track meta items' positions
T76541 Somehow(?) load document-level data (e.g. internal lists, meta lists) for the whole document but only the content for a part of the document
T49344 Internal nodes should eventually be in a separate document ("sub-documents")
T55784 Use Parsoid HTML for read-only views too
T50429 Support editing parts of a page in VisualEditor
T70042 When saving a page, only send back to Parsoid the parts of the page that have been changed
T55826 Lazy load extensions' large resources in VisualEditor, rather than blocking load
T55825 Reduce VisualEditor's memory usage
T55093 For very large pages on slow connections (when a timeout happens?), users get an "Error: Unknown error" on saving changes in VisualEditor (but change is indeed saved)
T54365 Explore performance gains from progressive (JIT?) de-alienation in VisualEditor
T53202 Draw VisualEditor's non-CE block highlights using SVG polygons
T52616 Improve VisualEditor's loading performance in Firefox
T76391 Only load item in harvest_template.py when needed
Pywikibugs
T75461 preloading using multiple properties does not work
T74266 User::isAnon should not cause an unnecessary load() call
T74228 At least one user is permanently unable to use Special:RecentChanges on translatewiki.net
T74221 hash_init leaks memory in hhvm, impacting performance of pbkdf2
T74194 Optimize assignSpawnedNode
T74024 find out what causes too high memcache io
T73635 QA: implement "login to <PAGE>" to speed up browser tests
T73539 Static data should go in ResourceLoaderGetConfigVars or data module, not MakeGlobalVariablesScript
T73476 Saving a new topic can take >5s on beta labs
T72485 Page inaccessible for ten minutes after edit due to PoolCounter pool-timeout
T72466 Gadget definitions are bloated
T72462 CentralNotice: $wgNoticeCloseButton shouldn't load closeWindow19x19.png from upload.wikimedia.org
T71610 Improve perf of rolling active editors with dba's suggestions
T71222 list=logevents slow for users with last log action long time ago
Springle
T71065 Special:AggregateGroups opening could be made faster
T70821 Provide an easy-to-run suite of performance regression tests
ori
T70620 slow query: INSERT /* JobQueueDB::doBatchPush 127.0.0.1 */ INTO `unittest_job` etc.
T69738 MarkAsHelpful: Don't use global delegate event handlers
T69698 Pre-render certain thumbnail sizes on upload
T69359 MultimediaViewer: In overlay viewer, shrinking window makes 4 requests for large images
T68961 Logging needs a log_title index
T68898 PageCuration: Get rid of synchronous AJAX request on page load
T68828 CentralAuth: Audit autologin procedure for performance and code quality
T68464 mediawiki.notification: Use CSS instead of javascript for upwards animation
T68218 External link Icon does not use asset from Wikifont
T67988 Don't load ULS IME on autofocused search bar
T67605 Port mmv.performance.js to core
T67394 performance testing environment
T67383 Serve thumbnails even for the original size of a jpeg or png
T67286 #p-logo should be at the top of <body>
T66581 ishmael shows blank graphs
Springle
T65725 Large number of CSS rules for external links
T65587 ResourceLoader: Avoid making a separate request for the site module
T65189 Loading message group takes more than 10 seconds
T64845 Evaluate performance impact of enabling TwitterCards extension on Wikimedia wikis
ori
T64463 Consider raising $wgMaxImageArea / $wgMaxAnimatedGifArea
T64000 WikiLove: Stylesheet should not embed both png and svg version of image
T63694 Reduce time to first byte
T63693 Fetching Captcha Image is really slow on testwiki
T63045 Category->getName and Categry->getID hit DB even if they already have the requested info
T62844 Default for $wgMaxShellMemory too low
T62193 asset-check.py and other front end performance instrumentation needs further thought
T60780 HTCP purges sent for random image thumbnails when visiting audio file on every hit
T60418 pagelinks table could use additional index to speed up Special:MostLinkedPages
T60192 Investigate WikiLove's performance
T60085 TimedMediaHandler should not add start-up scripts
T60083 Performance issues in TimedMediaHandler (tracking)
T60082 MwEmbedSupport injects too many JavaScript configuration variables
T59987 board-history action performs network requests in a loop
T59952 Pre-fetch VisualEditor modules to improve load speed
T59750 Use diff information to optimize database updates when saving an entity.
T59677 504 Gateway Time-out when modifying big articles in the Galician wikipedia
T59264 self-conflict when editing huge pages
T59176 ApiQueryExtLinksUsage::run query has crazy limit
T59126 Provide a JavaScript API for geoip lookups
T58633 Preference retrieval should not require so much parsing
T58292 Make ULS more lightweight (tracking)
T58041 updateCollation.php script prohibitively slow for very large wikis
T57931 mw.webfonts.setup takes 3 seconds on Special:ManageMessageGroups
T57842 UI tests should check performance on slow connections
T57735 ERR_READ_TIMEOUT when editing page with table with 1000 entries
T57524 Enforce proper nesting of most templates, and encapsulate compound content blocks
T57024 Support of preload param in page.get()
T57013 Optimize multiple replace.py instances
T56746 Load resources dynamically as we need them
T56555 Add force option to editTime
Strainu
T56465 Campaigns API call is very, very slow
T56098 [UI] Front-end performance: Improve loading time of items
T56033 Files/images should be fetched in batch by parser, not one at a time
T55852 Special:PagesWithProp should use &continue=<last primary key> style paging instead of &offset=<last count>
T55744 Update stucks on "Purging caches" of objectcache table
T55497 Run EventLogging test to determine best DC for each country
ori
T55245 Audit jQuery use in UploadWizard
T54777 user_properties table bloat
T53360 Special:Version with exts in git is too slow, needs caching or using something other than git show
T52979 Increase wgQueryCacheLimit from 1000 to 2000 on en.wiki
T52306 Provide info about referenced entities to UI in an efficient way
T52518 Add a notice on load for users of slower computers advising them to use source mode instead of VisualEditor
T52305 Make property info (data type, labels) available via the API
T51734 504 Gateway Time-out when editing page with a lot of transclusions
T51528 MediaWiki tries to create a thumbnail multiple times although that is not needed
T51504 ipb_range_start and ipb_range_end should be blank for single-IP blocks
T51244 Infinite loops/excessive execution time in DairikiDiff.php
T51118 Limit number of image scaling attempts
T49723 Cache action=credits results
T49722 Make action=credits faster
T49721 Restore action=credits on WMF wikis
T49512 Switch AbuseFilter to using Lua
T49490 resetUserTokens.php not usable on large wikis
T49422 don't update user touched on Special:AbuseLog?wpSearchUser=${ip} reads
T49375 Address "DB transaction callbacks still pending" warnings from Database.php
T48561 cleanUp UTF normalization tests should use data providers
T48098 Disable miser mode ($wgMiserMode) on small wikis (wikis in small.dblist)
T48094 Re-enable disabled Special pages on medium wikis (wikis in medium.dblist)
Reedy
T47900 Does MediaWiki use more memory for something than it did before?
T47476 Enable Unicode normalization for Malayalam on Wikimedia Wikis
T47267 Opening diff [Working ...] is extremely slow, apparently client-side
T47145 Load editing toolbar on element ready instead of content ready
T46362 ResourceLoaderWikiModule should query page modification times in batches
T46295 InstantCommons hotlinks Wikimedia Commons for full size
T45936 High priority jobs like enotifs are executed very slowly
T44783 Do not rerender whole page when only sitelinks are updated
T44653 en.wikipedia.org load takes 12+ seconds in specific Source IP range, as one specific call to bits.wikimedia.org/.../load.php times out
T44244 LQT should not do any calls on Title::isValidMoveOperation unconditionally, especially when the titles are not related to threads at all
T44180 make "refreshLinks.php --dfn-only" faster (to work on en.wiki)
T43377 Linker::link is inefficient
T43250 cleanupUploadStash.php is slow and bloated
T43103 initialization of the Language object is very heavy
T42870 Sorting files in category by size
T42854 Updater should not add contenthandler stuff to the DB if $wgContentHandlerUseDB is disabled.
T42260 Long delay in passing a request to long pages in Arabic Wikipedia
T40945 Need a way to simulate replication lag to test replag issues
Nikerabbit
T38731 Cache dir listings to avoid excessive fstat calls
T38599 Upload speed with chunked uploads is very slow
T36876 jquery.makeCollapsible() very slow if many collapsible, initially collapsed elements
T36261 Allow $wgProxyList to use a CDB file or similar
T36236 Stress the importance of a cache during install (APC or memcached)
T32425 Parser should cache the output of identical template calls as well as parameterless calls
T31784 ResourceLoader: JsMinPlus is too memory hungry (memory leaks?)
T30025 Out of memory error in LiquidThreads when viewing some LQT talk pages
T29488 Allow user scripts to load from position top
T28398 ResourceLoader preloads blob metadata, then does another query for blob contents
T25510 "Replace all" is very slow: WikiEditor should do a one-step replace when replacing all occurrences
T25339 bogus page/user invalidations
T24559 extremely poor performance with vertical files
T23245 hidden category changes shouldn't cause html invalidations
T22487 useless autopromotion at every request
T20858 Can't open documents from Internet Explorer (IE) address bar thru img_auth.php
T20489 MediaWiki needs better throttling for expensive queries
T20229 Special:Recentchanges for logged-in users should use fewer sql queries
T19577 Thumbnail urls should be versioned and sent with Expires headers
T13739 Inverse selection for [[Special:Log]]
T13402 Deleting of pages with high number of revisions makes server cry
T12348 MimeMagic aliases the empty string to all "main" mime types
T6715 Allow comments longer than 255 bytes
Bawolff
T5311 Automatic category redirects
Parent5446
T4085 Add a {{USERLANGUAGE}}/{{USERLANG}} magic word

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