diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformAppleSimulator.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformAppleSimulator.cpp
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformAppleSimulator.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformAppleSimulator.cpp
@@ -530,6 +530,8 @@
   }
 
   static PlatformSP CreateInstance(bool force, const ArchSpec *arch) {
+    if (arch && arch->IsValid() && !arch->TripleEnvironmentWasSpecified())
+      return nullptr; // Avoid very slow xcrun query for non-simulator archs.
     llvm::StringRef sdk;
     sdk = HostInfo::GetXcodeSDKPath(XcodeSDK("iPhoneSimulator.Internal.sdk"));
     if (sdk.empty())
@@ -578,6 +580,8 @@
   }
 
   static PlatformSP CreateInstance(bool force, const ArchSpec *arch) {
+    if (arch && arch->IsValid() && !arch->TripleEnvironmentWasSpecified())
+      return nullptr; // Avoid very slow xcrun query for non-simulator archs.
     return PlatformAppleSimulator::CreateInstance(
         "PlatformAppleTVSimulator", g_tvos_description,
         ConstString(g_tvos_plugin_name),
@@ -619,6 +623,8 @@
   }
 
   static PlatformSP CreateInstance(bool force, const ArchSpec *arch) {
+    if (arch && arch->IsValid() && !arch->TripleEnvironmentWasSpecified())
+      return nullptr; // Avoid very slow xcrun query for non-simulator archs.
     return PlatformAppleSimulator::CreateInstance(
         "PlatformAppleWatchSimulator", g_watchos_description,
         ConstString(g_watchos_plugin_name),