Cache HasFilePicker() value in UiContext

distribution/changelog.txt

@@ -3,6 +3,7 @@
 - Feature: [#14071] “Vandals stopped” statistic for security guards.
 - Feature: [#14296] Allow using early scenario completion in multiplayer.
 - Fix: [#11829] Visual glitches and crashes when using RCT1 assets from mismatched or corrupt CSG1.DAT and CSG1i.DAT files.
+- Fix: [#13581] Opening the Options menu causes a noticeable drop in FPS.
 - Fix: [#13894] Block brakes do not animate.
 - Fix: [#14315] Crash when trying to rename Air Powered Vertical Coaster in Korean.
 - Fix: [#14330] join_server uses default_port from config.

src/openrct2-ui/UiContext.Linux.cpp

@@ -35,6 +35,8 @@ namespace OpenRCT2::Ui
     class LinuxContext final : public IPlatformUiContext
     {
     private:
+        mutable std::optional<bool> _hasFilePicker = std::nullopt;
+
     public:
         LinuxContext()
         {
@@ -253,8 +255,13 @@ namespace OpenRCT2::Ui
 
         bool HasFilePicker() const override
         {
-            std::string dummy;
-            return GetDialogApp(&dummy) != DIALOG_TYPE::NONE;
+            if (!_hasFilePicker.has_value())
+            {
+                std::string dummy;
+                _hasFilePicker = (GetDialogApp(&dummy) != DIALOG_TYPE::NONE);
+            }
+
+            return _hasFilePicker.value();
         }
 
         bool HasMenuSupport() override