diff --git a/src/spicy/manager.cc b/src/spicy/manager.cc
index 4ae035cf90..0e4e16372f 100644
--- a/src/spicy/manager.cc
+++ b/src/spicy/manager.cc
@@ -244,7 +244,7 @@ void Manager::registerType(const std::string& id, const TypePtr& type) {
     zeek_id->SetType(type);
     zeek_id->MakeType();
 
-    detail::zeekygen_mgr->Identifier(zeek_id);
+    detail::zeekygen_mgr->Identifier(std::move(zeek_id));
 
     if ( _module_info )
         _module_info->AddBifItem(id, ::zeek::plugin::BifItem::TYPE);
@@ -281,7 +281,7 @@ void Manager::registerEvent(const std::string& name) {
     if ( auto id = detail::lookup_ID(name.c_str(), mod.c_str(), false, false, false) ) {
         // Auto-export IDs that already exist.
         id->SetExport();
-        _events[name] = id;
+        _events[name] = std::move(id);
     }
     else
         // This installs & exports the ID, but it doesn't set its type yet.
@@ -632,7 +632,7 @@ void Manager::InitPostScript() {
     hilti_config.abort_on_exceptions = id::find_const("Spicy::abort_on_exceptions")->AsBool();
     hilti_config.show_backtraces = id::find_const("Spicy::show_backtraces")->AsBool();
 
-    hilti::rt::configuration::set(hilti_config);
+    hilti::rt::configuration::set(std::move(hilti_config));
 
     auto spicy_config = ::spicy::rt::configuration::get();
     spicy_config.hook_accept_input = hook_accept_input;
@@ -686,7 +686,7 @@ void Manager::InitPostScript() {
         if ( ! tag )
             reporter->InternalError("cannot get analyzer tag for '%s'", p.name_analyzer.c_str());
 
-        auto register_analyzer_for_port = [&](auto tag, const hilti::rt::Port& port_) {
+        auto register_analyzer_for_port = [&](const auto& tag, const hilti::rt::Port& port_) {
             SPICY_DEBUG(hilti::rt::fmt("  Scheduling analyzer for port %s", port_));
 
             // Well-known ports are registered in scriptland, so we'll raise an
@@ -695,7 +695,7 @@ void Manager::InitPostScript() {
             vals.emplace_back(tag.AsVal());
             vals.emplace_back(zeek::spicy::rt::to_val(port_, base_type(TYPE_PORT)));
             EventHandlerPtr handler = event_registry->Register("spicy_analyzer_for_port");
-            event_mgr.Enqueue(handler, vals);
+            event_mgr.Enqueue(handler, std::move(vals));
         };
 
         for ( const auto& ports : p.ports ) {
@@ -717,7 +717,7 @@ void Manager::InitPostScript() {
         }
 
         if ( p.parser_resp ) {
-            for ( auto port : p.parser_resp->ports ) {
+            for ( const auto& port : p.parser_resp->ports ) {
                 if ( port.direction != ::spicy::rt::Direction::Both &&
                      port.direction != ::spicy::rt::Direction::Responder )
                     continue;
@@ -742,7 +742,7 @@ void Manager::InitPostScript() {
         if ( ! tag )
             reporter->InternalError("cannot get analyzer tag for '%s'", p.name_analyzer.c_str());
 
-        auto register_analyzer_for_mime_type = [&](auto tag, const std::string& mt) {
+        auto register_analyzer_for_mime_type = [&](const auto& tag, const std::string& mt) {
             SPICY_DEBUG(hilti::rt::fmt("  Scheduling analyzer for MIME type %s", mt));
 
             // MIME types are registered in scriptland, so we'll raise an
@@ -751,7 +751,7 @@ void Manager::InitPostScript() {
             vals.emplace_back(tag.AsVal());
             vals.emplace_back(make_intrusive<StringVal>(mt));
             EventHandlerPtr handler = event_registry->Register("spicy_analyzer_for_mime_type");
-            event_mgr.Enqueue(handler, vals);
+            event_mgr.Enqueue(handler, std::move(vals));
         };
 
         for ( const auto& mt : p.mime_types )
diff --git a/src/spicy/runtime-support.cc b/src/spicy/runtime-support.cc
index 77e05bf903..bf05925a4f 100644
--- a/src/spicy/runtime-support.cc
+++ b/src/spicy/runtime-support.cc
@@ -120,7 +120,7 @@ TypePtr rt::create_enum_type(
         etype->AddName(ns, name.c_str(), lval, true);
     }
 
-    return etype;
+    return std::move(etype);
 }
 
 TypePtr rt::create_record_type(const std::string& ns, const std::string& id,
@@ -289,7 +289,7 @@ void rt::debug(const Cookie& cookie, const std::string& msg) {
             hilti::rt::fmt("[%s/%" PRIu32 "/%s] %s", name, p->analyzer->GetID(), (p->is_orig ? "orig" : "resp"), msg));
     }
     else if ( const auto f = cookie.file ) {
-        auto name = file_mgr->GetComponentName(f->analyzer->Tag());
+        const auto& name = file_mgr->GetComponentName(f->analyzer->Tag());
         SPICY_DEBUG(hilti::rt::fmt("[%s/%" PRIu32 "] %s", name, f->analyzer->GetID(), msg));
     }
     else if ( const auto f = cookie.packet ) {
diff --git a/src/spicy/runtime-support.h b/src/spicy/runtime-support.h
index a12780c870..78d82d3897 100644
--- a/src/spicy/runtime-support.h
+++ b/src/spicy/runtime-support.h
@@ -705,7 +705,7 @@ inline ValPtr to_val(const hilti::rt::Vector<T>& v, const TypePtr& target) {
     for ( const auto& i : v )
         zv->Assign(zv->Size(), to_val(i, vt->Yield()));
 
-    return zv;
+    return std::move(zv);
 }
 
 /**
diff --git a/src/spicy/spicy.bif b/src/spicy/spicy.bif
index 1c8b38ab5f..37ab40415b 100644
--- a/src/spicy/spicy.bif
+++ b/src/spicy/spicy.bif
@@ -56,5 +56,5 @@ function Spicy::__resource_usage%(%) : Spicy::ResourceUsage
     r->Assign(n++, ru.max_fiber_stack_size);
     r->Assign(n++, ru.cached_fibers);
 
-    return r;
+    return std::move(r);
     %}
diff --git a/src/spicy/spicyz/driver.cc b/src/spicy/spicyz/driver.cc
index 3cbd91d302..60345277e1 100644
--- a/src/spicy/spicyz/driver.cc
+++ b/src/spicy/spicyz/driver.cc
@@ -137,7 +137,7 @@ hilti::Result<hilti::Nothing> Driver::loadFile(hilti::rt::filesystem::path file,
                 hilti::util::fmt("error computing path of %s relative to %s: %s", file, relative_to, ec.message()));
 
         if ( exists )
-            file = p;
+            file = std::move(p);
     }
 
     auto exists = hilti::rt::filesystem::exists(file, ec);
diff --git a/src/spicy/spicyz/glue-compiler.cc b/src/spicy/spicyz/glue-compiler.cc
index a23446446d..95b3f85752 100644
--- a/src/spicy/spicyz/glue-compiler.cc
+++ b/src/spicy/spicyz/glue-compiler.cc
@@ -422,7 +422,7 @@ void GlueCompiler::preprocessEvtFile(hilti::rt::filesystem::path& path, std::ist
             // Output empty line to keep line numbers the same
             out << '\n';
 
-            auto m = hilti::util::split1(trimmed);
+            auto m = hilti::util::split1(std::move(trimmed));
 
             if ( auto rc = pp.processLine(m.first, m.second); ! rc )
                 throw ParseError(rc.error());
@@ -517,7 +517,7 @@ bool GlueCompiler::loadEvtFile(hilti::rt::filesystem::path& path) {
                 else
                     SPICY_DEBUG(hilti::util::fmt("  Got module %s to import", module));
 
-                _imports.emplace_back(hilti::ID(module), std::move(scope));
+                _imports.emplace_back(hilti::ID(std::move(module)), std::move(scope));
             }
 
             else if ( looking_at(*chunk, 0, "export") ) {
@@ -699,7 +699,7 @@ glue::ProtocolAnalyzer GlueCompiler::parseProtocolAnalyzer(const std::string& ch
 
                 case both:
                     a.unit_name_orig = unit;
-                    a.unit_name_resp = unit;
+                    a.unit_name_resp = std::move(unit);
                     break;
             }
         }
@@ -1370,7 +1370,7 @@ bool GlueCompiler::CreateSpicyHook(glue::Event* ev) {
 #endif
     auto parameters = hilti::util::transform(ev->parameters, [](const auto& p) { return p.get(); });
     auto unit_hook = builder()->declarationHook(parameters, body.block(), attrs, meta);
-    auto hook_decl = builder()->declarationUnitHook(ev->hook, unit_hook, meta);
+    auto hook_decl = builder()->declarationUnitHook(ev->hook, unit_hook, std::move(meta));
     ev->spicy_module->spicy_module->add(context(), hook_decl);
 
     return true;