msglocal.dll is for some reason loaded at startup even when no mail functions are used. I started the browser and browsed a little at random and no (real) functions in the dll were called. The functions called were: nsMsgLocalMailFolderConstructor nsMsgLocalModule::AddRef(void) nsMsgLocalModule::QueryInterface(nsID const&,void * *) nsMsgLocalModule::Release(void) NSGetModule nsMsgLocalModule::GetClassObject(nsIComponentManager *,nsID const&,nsID const&,void * *) nsMsgLocalModule::Initialize(void) nsMsgLocalModule::nsMsgLocalModule(void) nsMsgLocalMailFolder::AddRef(void) nsMsgLocalMailFolder::Release(void) nsMsgLocalMailFolder::QueryInterface(nsID const&,void * *) nsMsgLocalMailFolder::CreateBaseMessageURI(char const*) nsMsgLocalMailFolder::Init(char const*) nsMsgLocalMailFolder::nsMsgLocalMailFolder(void) Clearly none of these justifies the loading of the dll. I think this might be connected to the loading of msgbsutl.dll (bug 46797) but I haven't checked further what's causing the load. It might be an easy kill though, decreasing startup time and reducing memory footprint.

So far I've seen that this dll gets dragged in by something RDF related. One offender seems to be RDFServiceImpl::GetResource("mailbox://danbr843@mail.student.liu.se/Drafts", ...); so maybe you got to have a mail account for this to happen. danbr843@mail.student.liu.se is my account where I test mail. I don't know how it got here but the stack trace below may help someone. It's CreateNewLocalStore that triggers everything as far as I can see. RDFServiceImpl::GetResource(RDFServiceImpl * const 0x00ccbbf8, const char * 0x0012e560, nsIRDFResource * * 0x0012ea94) line 649 + 40 bytes RDFServiceImpl::GetUnicodeResource(RDFServiceImpl * const 0x00ccbbf8, const unsigned short * 0x0012e858, nsIRDFResource * * 0x0012ea94) line 701 + 38 bytes RDFContentSinkImpl::GetIdAboutAttribute(const nsIParserNode & {...}, nsIRDFResource * * 0x0012ea94) line 1014 + 34 bytes RDFContentSinkImpl::OpenObject(const nsIParserNode & {...}) line 1287 + 39 bytes RDFContentSinkImpl::OpenContainer(RDFContentSinkImpl * const 0x0259abf0, const nsIParserNode & {...}) line 543 + 15 bytes CWellFormedDTD::HandleStartToken(CToken * 0x00d18188) line 638 + 22 bytes CWellFormedDTD::HandleToken(CWellFormedDTD * const 0x025b9ba0, CToken * 0x00d18188, nsIParser * 0x025f09a0) line 521 + 12 bytes CWellFormedDTD::BuildModel(CWellFormedDTD * const 0x025b9ba0, nsIParser * 0x025f09a0, nsITokenizer * 0x02599b20, nsITokenObserver * 0x00000000, nsIContentSink * 0x0259abf0) line 258 + 20 bytes nsParser::BuildModel() line 1979 + 34 bytes nsParser::ResumeParse(int 1, int 0) line 1860 + 11 bytes nsParser::OnDataAvailable(nsParser * const 0x025f09a8, nsIChannel * 0x025bc2b0, nsISupports * 0x00000000, nsIInputStream * 0x025fb1c0, unsigned int 0, unsigned int 1024) line 2310 + 19 bytes RDFXMLDataSourceImpl::OnDataAvailable(RDFXMLDataSourceImpl * const 0x0253fd70, nsIChannel * 0x025bc2b0, nsISupports * 0x00000000, nsIInputStream * 0x025fb1c0, unsigned int 0, unsigned int 1024) line 1090 rdf_BlockingParse(nsIURI * 0x024d5b58, nsIStreamListener * 0x0253fd70) line 612 + 38 bytes RDFXMLDataSourceImpl::Refresh(RDFXMLDataSourceImpl * const 0x0253fd64, int 1) line 914 + 58 bytes LocalStoreImpl::Refresh(LocalStoreImpl * const 0x00d2e618, int 1) line 337 + 27 bytes NS_NewLocalStore(nsILocalStore * * 0x0012f32c) line 242 + 18 bytes CreateNewLocalStore(nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f3d0) line 109 + 53 bytes nsGenericFactory::CreateInstance(nsGenericFactory * const 0x00d2e3b8, nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f3d0) line 48 nsComponentManagerImpl::CreateInstance(nsComponentManagerImpl * const 0x009a8b00, const nsID & {...}, nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f3d0) line 1237 + 24 bytes nsComponentManager::CreateInstance(const nsID & {...}, nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f3d0) line 82 nsServiceManagerImpl::GetService(nsServiceManagerImpl * const 0x009a8300, const nsID & {...}, const nsID & {...}, nsISupports * * 0x0012f634, nsIShutdownListener * 0x00000000) line 346 + 19 bytes nsServiceManager::GetService(const nsID & {...}, const nsID & {...}, nsISupports * * 0x0012f634, nsIShutdownListener * 0x00000000) line 562 nsXULDocument::Init() line 3976 + 23 bytes NS_NewXULDocument(nsIXULDocument * * 0x0012f668) line 560 + 8 bytes CreateNewXULDocument(nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f734) line 103 + 53 bytes nsGenericFactory::CreateInstance(nsGenericFactory * const 0x00d37760, nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f734) line 48 nsComponentManagerImpl::CreateInstance(nsComponentManagerImpl * const 0x009a8b00, const nsID & {...}, nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f734) line 1237 + 24 bytes nsComponentManager::CreateInstance(const nsID & {...}, nsISupports * 0x00000000, const nsID & {...}, void * * 0x0012f734) line 82 nsLayoutDLF::CreateRDFDocument(nsISupports * 0x00000000, nsCOMPtr<nsIDocument> * 0x0012f734, nsCOMPtr<nsIDocumentViewer> * 0x0012f730) line 424 + 42 bytes nsLayoutDLF::CreateRDFDocument(const char * 0x01da5900, nsIChannel * 0x024d29b8, nsILoadGroup * 0x00df02d0, const char * 0x0012fa68, nsISupports * 0x00df0048, nsISupports * 0x00000000, nsIStreamListener * * 0x0012fabc, nsIContentViewer * * 0x0012f96c) line 450 + 20 bytes nsLayoutDLF::CreateInstance(nsLayoutDLF * const 0x00d384c0, const char * 0x01da5900, nsIChannel * 0x024d29b8, nsILoadGroup * 0x00df02d0, const char * 0x0012fa68, nsISupports * 0x00df0048, nsISupports * 0x00000000, nsIStreamListener * * 0x0012fabc, nsIContentViewer * * 0x0012f96c) line 286 + 40 bytes nsDocShell::NewContentViewerObj(nsDocShell * const 0x00df0028, const char * 0x0012fa68, nsIChannel * 0x024d29b8, nsILoadGroup * 0x00df02d0, nsIStreamListener * * 0x0012fabc, nsIContentViewer * * 0x0012f96c) line 2442 + 132 bytes nsDocShell::CreateContentViewer(nsDocShell * const 0x00df0028, const char * 0x0012fa68, nsIChannel * 0x024d29b8, nsIStreamListener * * 0x0012fabc) line 2382 + 60 bytes nsDSURIContentListener::DoContent(nsDSURIContentListener * const 0x00df01b0, const char * 0x0012fa68, int 0, const char * 0x1009fc78 gCommonEmptyBuffer, nsIChannel * 0x024d29b8, nsIStreamListener * * 0x0012fabc, int * 0x0012fa4c) line 100 + 33 bytes nsDocumentOpenInfo::DispatchContent(nsIChannel * 0x024d29b8, nsISupports * 0x00000000) line 359 + 109 bytes nsDocumentOpenInfo::OnStartRequest(nsDocumentOpenInfo * const 0x00de46e0, nsIChannel * 0x024d29b8, nsISupports * 0x00000000) line 233 + 16 bytes nsResChannel::OnStartRequest(nsResChannel * const 0x024d29bc, nsIChannel * 0x024d2c38, nsISupports * 0x00000000) line 678 nsFileChannel::OnStartRequest(nsFileChannel * const 0x024d2c40, nsIChannel * 0x024d2cf0, nsISupports * 0x00000000) line 619 nsOnStartRequestEvent::HandleEvent(nsOnStartRequestEvent * const 0x024d3db8) line 210 + 26 bytes nsStreamListenerEvent::HandlePLEvent(PLEvent * 0x024d3e10) line 97 + 12 bytes PL_HandleEvent(PLEvent * 0x024d3e10) line 587 + 10 bytes PL_ProcessPendingEvents(PLEventQueue * 0x00cd8310) line 528 + 9 bytes _md_EventReceiverProc(HWND__ * 0x000a1140, unsigned int 49519, unsigned int 0, long 13468432) line 1043 + 9 bytes USER32! 77e13eb0() USER32! 77e1401a() USER32! 77e192da() nsAppShellService::Run(nsAppShellService * const 0x00cdc018) line 387 main1(int 1, char * * 0x009a7e60, nsISupports * 0x00000000) line 913 + 32 bytes main(int 1, char * * 0x009a7e60) line 1093 + 37 bytes mainCRTStartup() line 338 + 17 bytes KERNEL32! 77e87903()

this is a dup of a putterman bug that's been futured for this release.

*** Bug 46797 has been marked as a duplicate of this bug. ***

Mail triage marking [nsbeta3-]

also adding to startup performance tracker bug 7251

Marking nsbeta1-. This would probably get solved by fixing the other bugs out there about loading mail dll's because of the way we store resources in localstore.rdf.

The only bug I could find that sounded like the one you said would fix this was bug 12896 which was not nominated , not flagged with the perf keyword, and Futured. Is that the one you think would probably fix this?

this is a dup of 12896. *** This bug has been marked as a duplicate of 12896 ***

verified dup.