diff --git a/apps/server/src/services/export/zip/share_theme.ts b/apps/server/src/services/export/zip/share_theme.ts
index 59746626f..efde0b5f5 100644
--- a/apps/server/src/services/export/zip/share_theme.ts
+++ b/apps/server/src/services/export/zip/share_theme.ts
@@ -51,8 +51,10 @@ export default class ShareThemeExportProvider extends ZipExportProvider {
 
         if (note) {
             content = renderNoteForExport(note, branch, basePath, noteMeta.notePath.slice(0, -1));
-            content = content.replace(/href="[^"]*\.\/([a-zA-Z0-9_\/]{12})[^"]*"/g, "href=\"#root/$1\"");
-            content = this.rewriteFn(content, noteMeta);
+            if (typeof content === "string") {
+                content = content.replace(/href="[^"]*\.\/([a-zA-Z0-9_\/]{12})[^"]*"/g, "href=\"#root/$1\"");
+                content = this.rewriteFn(content, noteMeta);
+            }
         }
 
         return content;
diff --git a/apps/server/src/share/content_renderer.ts b/apps/server/src/share/content_renderer.ts
index 529db2116..d5c3a4c9e 100644
--- a/apps/server/src/share/content_renderer.ts
+++ b/apps/server/src/share/content_renderer.ts
@@ -18,6 +18,7 @@ import { readFileSync } from "fs";
 
 const shareAdjustedAssetPath = isDev ? assetPath : `../${assetPath}`;
 const shareAdjustedAppPath = isDev ? app_path : `../${app_path}`;
+const templateCache: Map<string, string> = new Map();
 
 /**
  * Represents the output of the content renderer.
@@ -194,7 +195,14 @@ function renderNoteContentInternal(note: SNote | BNote, renderArgs: RenderArgs)
 }
 
 function readTemplate(path: string) {
-    return readFileSync(path, "utf-8");
+    const cachedTemplate = templateCache.get(path);
+    if (cachedTemplate) {
+        return cachedTemplate;
+    }
+
+    const templateString = readFileSync(path, "utf-8");
+    templateCache.set(path, templateString);
+    return templateString;
 }
 
 function getContent(note: SNote | BNote) {