diff --git a/data/language/en-GB.txt b/data/language/en-GB.txt
index 5a16c38273..c961ad5969 100644
--- a/data/language/en-GB.txt
+++ b/data/language/en-GB.txt
@@ -2885,7 +2885,7 @@ STR_5755    :Incorrect Software Version (Server is using {STRING})
 STR_5756    :Bad Password
 STR_5757    :Server Full
 STR_5758    :{OUTLINE}{GREEN}{STRING} has joined the game
-STR_5759    :Downloading map … ({INT32} / {INT32}) KiB
+STR_5759    :Downloading map …
 STR_5760    :Hong Kong Dollars (HK$)
 STR_5761    :New Taiwan Dollar (NT$)
 STR_5762    :Chinese Yuan (CN¥)
@@ -3449,7 +3449,7 @@ STR_6374    :C
 STR_6375    :Unknown Ride
 STR_6376    :{WINDOW_COLOUR_2}Ride vehicle:{NEWLINE}{BLACK}{STRINGID} for {STRINGID}
 STR_6377    :{WINDOW_COLOUR_2}Type: {BLACK}{STRINGID} for {STRINGID}
-STR_6378    :Receiving objects list: {INT32} / {INT32}
+STR_6378    :Receiving objects list…
 STR_6379    :Received invalid data
 STR_6380    :Update available!
 STR_6381    :Join OpenRCT2 Discord!
@@ -3713,6 +3713,8 @@ STR_6638    :Enlarged UI
 STR_6639    :Modifies the interface to be more suitable for touch usage
 STR_6640    :Edit asset packs…
 STR_6641    :Loading/progress window
+STR_6642    :{STRING} ({COMMA32} / {COMMA32})
+STR_6643    :{STRING} ({COMMA32} / {COMMA32} KiB)
 
 #############
 # Scenarios #
diff --git a/src/openrct2-ui/WindowManager.cpp b/src/openrct2-ui/WindowManager.cpp
index c6e21df348..cc0dc13c37 100644
--- a/src/openrct2-ui/WindowManager.cpp
+++ b/src/openrct2-ui/WindowManager.cpp
@@ -346,7 +346,8 @@ public:
             {
                 uint32_t currentProgress = intent->GetUIntExtra(INTENT_EXTRA_PROGRESS_OFFSET);
                 uint32_t totalCount = intent->GetUIntExtra(INTENT_EXTRA_PROGRESS_TOTAL);
-                ProgressWindowSet(currentProgress, totalCount);
+                StringId format = intent->GetUIntExtra(INTENT_EXTRA_STRING_ID);
+                ProgressWindowSet(currentProgress, totalCount, format);
                 return nullptr;
             }
 
diff --git a/src/openrct2-ui/windows/ProgressWindow.cpp b/src/openrct2-ui/windows/ProgressWindow.cpp
index 7d56ab873e..00f6aebfa2 100644
--- a/src/openrct2-ui/windows/ProgressWindow.cpp
+++ b/src/openrct2-ui/windows/ProgressWindow.cpp
@@ -14,6 +14,7 @@
 #include <openrct2/drawing/Drawing.h>
 #include <openrct2/drawing/Text.h>
 #include <openrct2/localisation/Localisation.h>
+#include <openrct2/localisation/StringIds.h>
 #include <openrct2/sprites.h>
 #include <random>
 #include <sstream>
@@ -70,8 +71,11 @@ namespace OpenRCT2::Ui::Windows
     {
     private:
         close_callback _onClose = nullptr;
-        std::string _captionTemplate;
+
+        StringId _progressFormat;
+        std::string _progressTitle;
         std::string _currentCaption;
+
         uint32_t _currentProgress;
         uint32_t _totalCount;
         int8_t style = -1;
@@ -148,18 +152,22 @@ namespace OpenRCT2::Ui::Windows
         {
             if (_totalCount > 0)
             {
-                std::stringstream caption;
-                caption << _captionTemplate;
-                caption << " (" << _currentProgress << " / " << _totalCount << ")";
-                _currentCaption = caption.str();
+                auto ft = Formatter();
+                ft.Add<const char*>(_progressTitle.c_str());
+                ft.Add<uint32_t>(_currentProgress);
+                ft.Add<uint32_t>(_totalCount);
+
+                _currentCaption = FormatStringIDLegacy(_progressFormat, ft.Data());
             }
             else
-                _currentCaption = _captionTemplate;
+                _currentCaption = _progressTitle;
 
             // Set window title
-            auto ft = Formatter::Common();
-            ft.Add<StringId>(STR_STRING);
-            ft.Add<const char*>(_currentCaption.c_str());
+            {
+                auto ft = Formatter::Common();
+                ft.Add<StringId>(STR_STRING);
+                ft.Add<const char*>(_currentCaption.c_str());
+            }
         }
 
         void OnDraw(DrawPixelInfo& dpi) override
@@ -195,9 +203,9 @@ namespace OpenRCT2::Ui::Windows
             GfxDrawSprite(clipDPI, variant.vehicle, ScreenCoordsXY(position, widget.bottom + 1));
         }
 
-        void SetCaptionTemplate(const std::string& text)
+        void SetCaption(const std::string& text)
         {
-            _captionTemplate = text;
+            _progressTitle = text;
             _currentProgress = 0;
             _totalCount = 0;
 
@@ -209,8 +217,13 @@ namespace OpenRCT2::Ui::Windows
             _onClose = onClose;
         }
 
-        void SetProgress(uint32_t currentProgress, uint32_t totalCount)
+        void SetProgress(uint32_t currentProgress, uint32_t totalCount, StringId format)
         {
+            if (format == STR_NONE)
+                _progressFormat = STR_STRING_M_OF_N;
+            else
+                _progressFormat = format;
+
             _currentProgress = currentProgress;
             _totalCount = totalCount;
             Invalidate();
@@ -233,12 +246,12 @@ namespace OpenRCT2::Ui::Windows
                 WF_10 | WF_TRANSPARENT | WF_CENTRE_SCREEN | WF_STICK_TO_FRONT);
         }
 
-        window->SetCaptionTemplate(text);
+        window->SetCaption(text);
         window->SetCloseCallback(onClose);
         return window;
     }
 
-    void ProgressWindowSet(uint32_t currentProgress, uint32_t totalCount)
+    void ProgressWindowSet(uint32_t currentProgress, uint32_t totalCount, StringId format)
     {
         auto window = WindowFindByClass(WindowClass::ProgressWindow);
         if (window == nullptr)
@@ -246,7 +259,7 @@ namespace OpenRCT2::Ui::Windows
             return;
         }
         auto progressWindow = static_cast<ProgressWindow*>(window);
-        progressWindow->SetProgress(currentProgress, totalCount);
+        progressWindow->SetProgress(currentProgress, totalCount, format);
     }
 
     // Closes the window, deliberately *without* executing the callback.
diff --git a/src/openrct2-ui/windows/Window.h b/src/openrct2-ui/windows/Window.h
index 653140e81d..66cd1e03fc 100644
--- a/src/openrct2-ui/windows/Window.h
+++ b/src/openrct2-ui/windows/Window.h
@@ -168,7 +168,7 @@ namespace OpenRCT2::Ui::Windows
     void WindowNetworkStatusClose();
 
     WindowBase* ProgressWindowOpen(const std::string& text, close_callback onClose = nullptr);
-    void ProgressWindowSet(uint32_t currentProgress, uint32_t totalCount);
+    void ProgressWindowSet(uint32_t currentProgress, uint32_t totalCount, StringId format = STR_NONE);
     void ProgressWindowClose();
 
     void WindowTextInputKey(WindowBase* w, uint32_t keycode);
diff --git a/src/openrct2/Context.cpp b/src/openrct2/Context.cpp
index c2fa8518ca..50ea85c61c 100644
--- a/src/openrct2/Context.cpp
+++ b/src/openrct2/Context.cpp
@@ -653,11 +653,12 @@ namespace OpenRCT2
             ContextOpenIntent(&intent);
         }
 
-        void SetProgress(uint32_t currentProgress, uint32_t totalCount) override
+        void SetProgress(uint32_t currentProgress, uint32_t totalCount, StringId format = STR_NONE) override
         {
             auto intent = Intent(INTENT_ACTION_PROGRESS_SET);
             intent.PutExtra(INTENT_EXTRA_PROGRESS_OFFSET, currentProgress);
             intent.PutExtra(INTENT_EXTRA_PROGRESS_TOTAL, totalCount);
+            intent.PutExtra(INTENT_EXTRA_STRING_ID, format);
             ContextOpenIntent(&intent);
         }
 
diff --git a/src/openrct2/Context.h b/src/openrct2/Context.h
index 88ea5b391c..39335fb622 100644
--- a/src/openrct2/Context.h
+++ b/src/openrct2/Context.h
@@ -160,7 +160,7 @@ namespace OpenRCT2
         virtual void DisposeDrawingEngine() abstract;
 
         virtual void OpenProgress(StringId captionStringId) abstract;
-        virtual void SetProgress(uint32_t currentProgress, uint32_t totalCount) abstract;
+        virtual void SetProgress(uint32_t currentProgress, uint32_t totalCount, StringId format = STR_NONE) abstract;
         virtual void CloseProgress() abstract;
 
         virtual bool LoadParkFromFile(
diff --git a/src/openrct2/localisation/StringIds.h b/src/openrct2/localisation/StringIds.h
index ac760410c4..178b0d76fe 100644
--- a/src/openrct2/localisation/StringIds.h
+++ b/src/openrct2/localisation/StringIds.h
@@ -1689,6 +1689,8 @@ enum : StringId
     STR_LOADING_TITLE_SEQUENCE = 6637,
 
     STR_THEME_LOADING_WINDOW = 6641,
+    STR_STRING_M_OF_N = 6642,
+    STR_STRING_M_OF_N_KIB = 6643,
 
     // Have to include resource strings (from scenarios and objects) for the time being now that language is partially working
     /* MAX_STR_COUNT = 32768 */ // MAX_STR_COUNT - upper limit for number of strings, not the current count strings
diff --git a/src/openrct2/network/NetworkBase.cpp b/src/openrct2/network/NetworkBase.cpp
index ce4eef6677..14bc539a30 100644
--- a/src/openrct2/network/NetworkBase.cpp
+++ b/src/openrct2/network/NetworkBase.cpp
@@ -2782,8 +2782,11 @@ void NetworkBase::Client_Handle_MAP([[maybe_unused]] NetworkConnection& connecti
         chunk_buffer.resize(size);
     }
 
+    const auto currentProgressKiB = (offset + chunksize) / 1024;
+    const auto totalSizeKiB = size / 1024;
+
     OpenNetworkProgress(STR_MULTIPLAYER_DOWNLOADING_MAP);
-    GetContext().SetProgress((offset + chunksize) / 1024, size / 1024);
+    GetContext().SetProgress(currentProgressKiB, totalSizeKiB, STR_STRING_M_OF_N_KIB);
 
     std::memcpy(&chunk_buffer[offset], const_cast<void*>(static_cast<const void*>(packet.Read(chunksize))), chunksize);
     if (offset + chunksize == size)
diff --git a/src/openrct2/windows/Intent.h b/src/openrct2/windows/Intent.h
index a9365b7341..3707b6d96b 100644
--- a/src/openrct2/windows/Intent.h
+++ b/src/openrct2/windows/Intent.h
@@ -131,4 +131,5 @@ enum
     INTENT_EXTRA_SCENERY_GROUP_ENTRY_INDEX,
     INTENT_EXTRA_PROGRESS_OFFSET,
     INTENT_EXTRA_PROGRESS_TOTAL,
+    INTENT_EXTRA_STRING_ID,
 };