Index: include/lldb/Core/Module.h
===================================================================
--- include/lldb/Core/Module.h
+++ include/lldb/Core/Module.h
@@ -614,6 +614,8 @@
 
   const FileSpec &GetSymbolFileFileSpec() const { return m_symfile_spec; }
 
+  void PrimeCaches();
+
   void SetSymbolFileFileSpec(const FileSpec &file);
 
   const llvm::sys::TimePoint<> &GetModificationTime() const {
Index: include/lldb/Symbol/SymbolFile.h
===================================================================
--- include/lldb/Symbol/SymbolFile.h
+++ include/lldb/Symbol/SymbolFile.h
@@ -180,6 +180,8 @@
                           uint32_t type_mask,
                           lldb_private::TypeList &type_list) = 0;
 
+  virtual void PrimeCaches();
+
   virtual lldb_private::TypeSystem *
   GetTypeSystemForLanguage(lldb::LanguageType language);
 
Index: include/lldb/Symbol/Symtab.h
===================================================================
--- include/lldb/Symbol/Symtab.h
+++ include/lldb/Symbol/Symtab.h
@@ -40,6 +40,7 @@
   Symtab(ObjectFile *objfile);
   ~Symtab();
 
+  void PrimeCaches();
   void Reserve(size_t count);
   Symbol *Resize(size_t count);
   uint32_t AddSymbol(const Symbol &symbol);
Index: include/lldb/Target/Target.h
===================================================================
--- include/lldb/Target/Target.h
+++ include/lldb/Target/Target.h
@@ -82,6 +82,10 @@
 
   bool SetPreferDynamicValue(lldb::DynamicValueType d);
 
+  bool GetCachePriming() const;
+
+  void SetCachePriming(bool b);
+
   bool GetDisableASLR() const;
 
   void SetDisableASLR(bool b);
Index: source/Core/Module.cpp
===================================================================
--- source/Core/Module.cpp
+++ source/Core/Module.cpp
@@ -1432,6 +1432,22 @@
   return sc_list.GetSize() - initial_size;
 }
 
+void Module::PrimeCaches() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  SymbolVendor * sym_vendor = GetSymbolVendor();
+  if (!sym_vendor) {
+    return;
+  }
+  // Prime the symbol file first, since it adds symbols to the symbol table.
+  if (SymbolFile *symbol_file = sym_vendor->GetSymbolFile()) {
+    symbol_file->PrimeCaches();
+  }
+  // Now we can prime the symbol table.
+  if (Symtab * symtab = sym_vendor->GetSymtab()) {
+    symtab->PrimeCaches();
+  }
+}
+
 void Module::SetSymbolFileFileSpec(const FileSpec &file) {
   if (!file.Exists())
     return;
Index: source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
===================================================================
--- source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
+++ source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
@@ -226,6 +226,8 @@
       const lldb_private::ConstString &name,
       const lldb_private::CompilerDeclContext *parent_decl_ctx) override;
 
+  void PrimeCaches() override;
+
   //------------------------------------------------------------------
   // PluginInterface protocol
   //------------------------------------------------------------------
Index: source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -1917,6 +1917,12 @@
   return sc_list.GetSize() - prev_size;
 }
 
+void SymbolFileDWARF::PrimeCaches() {
+  std::lock_guard<std::recursive_mutex> guard(
+      GetObjectFile()->GetModule()->GetMutex());
+  Index();
+}
+
 void SymbolFileDWARF::Index() {
   if (m_indexed)
     return;
Index: source/Symbol/SymbolFile.cpp
===================================================================
--- source/Symbol/SymbolFile.cpp
+++ source/Symbol/SymbolFile.cpp
@@ -21,6 +21,10 @@
 
 using namespace lldb_private;
 
+void SymbolFile::PrimeCaches() {
+  // No-op for most implementations.
+}
+
 SymbolFile *SymbolFile::FindPlugin(ObjectFile *obj_file) {
   std::unique_ptr<SymbolFile> best_symfile_ap;
   if (obj_file != nullptr) {
Index: source/Symbol/Symtab.cpp
===================================================================
--- source/Symbol/Symtab.cpp
+++ source/Symbol/Symtab.cpp
@@ -425,6 +425,11 @@
   }
 }
 
+void Symtab::PrimeCaches() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  InitNameIndexes();
+}
+
 void Symtab::AppendSymbolNamesToMap(const IndexCollection &indexes,
                                     bool add_demangled, bool add_mangled,
                                     NameToIndexMap &name_to_index_map) const {
Index: source/Target/Target.cpp
===================================================================
--- source/Target/Target.cpp
+++ source/Target/Target.cpp
@@ -1870,6 +1870,11 @@
           }
         }
 
+        // Prime caches outside of any lock, so hopefully we can do this for
+        // each library in parallel.
+        if (GetCachePriming())
+          module_sp->PrimeCaches();
+
         if (old_module_sp &&
             m_images.GetIndexForModule(old_module_sp.get()) !=
                 LLDB_INVALID_INDEX32) {
@@ -3277,6 +3282,8 @@
     {"detach-on-error", OptionValue::eTypeBoolean, false, true, nullptr,
      nullptr, "debugserver will detach (rather than killing) a process if it "
               "loses connection with lldb."},
+    {"cache-priming", OptionValue::eTypeBoolean, false, true, nullptr, nullptr,
+     "Enable loading of symbol tables before they are needed."},
     {"disable-aslr", OptionValue::eTypeBoolean, false, true, nullptr, nullptr,
      "Disable Address Space Layout Randomization (ASLR)"},
     {"disable-stdio", OptionValue::eTypeBoolean, false, false, nullptr, nullptr,
@@ -3379,6 +3386,7 @@
   ePropertyOutputPath,
   ePropertyErrorPath,
   ePropertyDetachOnError,
+  ePropertyCachePriming,
   ePropertyDisableASLR,
   ePropertyDisableSTDIO,
   ePropertyInlineStrategy,
@@ -3641,6 +3649,17 @@
   return m_collection_sp->SetPropertyAtIndexAsEnumeration(nullptr, idx, d);
 }
 
+bool TargetProperties::GetCachePriming() const {
+  const uint32_t idx = ePropertyCachePriming;
+  return m_collection_sp->GetPropertyAtIndexAsBoolean(
+      nullptr, idx, g_properties[idx].default_uint_value != 0);
+}
+
+void TargetProperties::SetCachePriming(bool b) {
+  const uint32_t idx = ePropertyCachePriming;
+  m_collection_sp->SetPropertyAtIndexAsBoolean(nullptr, idx, b);
+}
+
 bool TargetProperties::GetDisableASLR() const {
   const uint32_t idx = ePropertyDisableASLR;
   return m_collection_sp->GetPropertyAtIndexAsBoolean(