diff --git a/lldb/source/Target/Target.cpp b/lldb/source/Target/Target.cpp
--- a/lldb/source/Target/Target.cpp
+++ b/lldb/source/Target/Target.cpp
@@ -62,6 +62,7 @@
 
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SetVector.h"
+#include "llvm/Support/ThreadPool.h"
 
 #include <memory>
 #include <mutex>
@@ -1623,6 +1624,17 @@
 void Target::ModulesDidLoad(ModuleList &module_list) {
   const size_t num_images = module_list.GetSize();
   if (m_valid && num_images) {
+    if (GetPreloadSymbols()) {
+      // Try to preload symbols in parallel.
+      llvm::ThreadPoolTaskGroup task_group(Debugger::GetThreadPool());
+      auto preload_symbols_fn = [&](size_t idx) {
+        ModuleSP module_sp(module_list.GetModuleAtIndex(idx));
+        module_sp->PreloadSymbols();
+      };
+      for (size_t idx = 0; idx < num_images; ++idx)
+        task_group.async(preload_symbols_fn, idx);
+      task_group.wait();
+    }
     for (size_t idx = 0; idx < num_images; ++idx) {
       ModuleSP module_sp(module_list.GetModuleAtIndex(idx));
       LoadScriptingResourceForModule(module_sp, this);
@@ -2170,11 +2182,6 @@
           });
         }
 
-        // Preload symbols outside of any lock, so hopefully we can do this for
-        // each library in parallel.
-        if (GetPreloadSymbols())
-          module_sp->PreloadSymbols();
-
         llvm::SmallVector<ModuleSP, 1> replaced_modules;
         for (ModuleSP &old_module_sp : old_modules) {
           if (m_images.GetIndexForModule(old_module_sp.get()) !=