diff --git a/src/network/network_content_gui.cpp b/src/network/network_content_gui.cpp
index 1b4b7e0300..7ee1dbd99f 100644
--- a/src/network/network_content_gui.cpp
+++ b/src/network/network_content_gui.cpp
@@ -304,6 +304,8 @@ class NetworkContentListWindow : public Window, ContentCallback {
 	uint filesize_sum;           ///< The sum of all selected file sizes
 	Scrollbar *vscroll;          ///< Cache of the vertical scrollbar
 
+	static char content_type_strs[CONTENT_TYPE_END][64]; ///< Cached strings for all content types.
+
 	/** Search external websites for content */
 	void OpenExternalSearch()
 	{
@@ -401,11 +403,7 @@ class NetworkContentListWindow : public Window, ContentCallback {
 	{
 		int r = 0;
 		if ((*a)->type != (*b)->type) {
-			char a_str[64];
-			char b_str[64];
-			GetString(a_str, STR_CONTENT_TYPE_BASE_GRAPHICS + (*a)->type - CONTENT_TYPE_BASE_GRAPHICS, lastof(a_str));
-			GetString(b_str, STR_CONTENT_TYPE_BASE_GRAPHICS + (*b)->type - CONTENT_TYPE_BASE_GRAPHICS, lastof(b_str));
-			r = strnatcmp(a_str, b_str);
+			r = strnatcmp(content_type_strs[(*a)->type], content_type_strs[(*b)->type]);
 		}
 		if (r == 0) r = NameSorter(a, b);
 		return r;
@@ -469,6 +467,7 @@ class NetworkContentListWindow : public Window, ContentCallback {
 		this->vscroll->ScrollTowards(this->list_pos);
 	}
 
+	friend void BuildContentTypeStringList();
 public:
 	/**
 	 * Create the content list window.
@@ -968,6 +967,18 @@ NetworkContentListWindow::GUIContentList::FilterFunction * const NetworkContentL
 	&TagNameFilter,
 };
 
+char NetworkContentListWindow::content_type_strs[CONTENT_TYPE_END][64];
+
+/**
+ * Build array of all strings corresponding to the content types.
+ */
+void BuildContentTypeStringList()
+{
+	for (int i = CONTENT_TYPE_BEGIN; i < CONTENT_TYPE_END; i++) {
+		GetString(NetworkContentListWindow::content_type_strs[i], STR_CONTENT_TYPE_BASE_GRAPHICS + i - CONTENT_TYPE_BASE_GRAPHICS, lastof(NetworkContentListWindow::content_type_strs[i]));
+	}
+}
+
 /** The widgets for the content list. */
 static const NWidgetPart _nested_network_content_list_widgets[] = {
 	NWidget(NWID_HORIZONTAL),
diff --git a/src/network/network_content_gui.h b/src/network/network_content_gui.h
index 212fcec04d..1397010019 100644
--- a/src/network/network_content_gui.h
+++ b/src/network/network_content_gui.h
@@ -43,4 +43,6 @@ public:
 	virtual void OnDownloadProgress(const ContentInfo *ci, int bytes);
 };
 
+void BuildContentTypeStringList();
+
 #endif /* NETWORK_CONTENT_GUI_H */
diff --git a/src/strings.cpp b/src/strings.cpp
index a7e60f846b..9c88b70c77 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -35,6 +35,7 @@
 #include "window_func.h"
 #include "debug.h"
 #include "game/game_text.hpp"
+#include "network/network_content_gui.h"
 #include <stack>
 
 #include "table/strings.h"
@@ -1814,6 +1815,7 @@ bool ReadLanguagePack(const LanguageMetadata *lang)
 	SortIndustryTypes();
 	BuildIndustriesLegend();
 	SortNetworkLanguages();
+	BuildContentTypeStringList();
 	InvalidateWindowClassesData(WC_BUILD_VEHICLE);      // Build vehicle window.
 	InvalidateWindowClassesData(WC_TRAINS_LIST);        // Train group window.
 	InvalidateWindowClassesData(WC_ROADVEH_LIST);       // Road vehicle group window.