diff --git a/eleventy.config.js b/eleventy.config.js
index 36bb6af..55335a9 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -10,7 +10,6 @@ import { minify } from "html-minifier-terser";
 import { createHash } from "crypto";
 import { execFileSync } from "child_process";
 import { readFileSync, existsSync } from "fs";
-import { generateOgImages } from "./lib/og.js";
 import { resolve, dirname } from "path";
 import { fileURLToPath } from "url";
 
@@ -526,12 +525,20 @@ export default function (eleventyConfig) {
   });
 
   // Generate OpenGraph images for posts without photos
-  eleventyConfig.on("eleventy.before", async () => {
+  eleventyConfig.on("eleventy.before", () => {
     const contentDir = resolve(__dirname, "content");
     const cacheDir = resolve(__dirname, ".cache");
     const siteName = process.env.SITE_NAME || "My IndieWeb Blog";
     try {
-      await generateOgImages(contentDir, cacheDir, siteName);
+      execFileSync(process.execPath, [
+        resolve(__dirname, "lib", "og-cli.js"),
+        contentDir,
+        cacheDir,
+        siteName,
+      ], {
+        stdio: "inherit",
+        env: { ...process.env, NODE_OPTIONS: "--max-old-space-size=768" },
+      });
     } catch (err) {
       console.error("[og] Image generation failed:", err.message);
     }
diff --git a/lib/og-cli.js b/lib/og-cli.js
new file mode 100644
index 0000000..421b5b0
--- /dev/null
+++ b/lib/og-cli.js
@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+/**
+ * CLI entry point for OG image generation.
+ * Runs as a separate process to isolate memory from Eleventy.
+ *
+ * Usage: node lib/og-cli.js <contentDir> <cacheDir> <siteName>
+ */
+
+import { generateOgImages } from "./og.js";
+
+const [contentDir, cacheDir, siteName] = process.argv.slice(2);
+
+if (!contentDir || !cacheDir || !siteName) {
+  console.error("[og] Usage: node og-cli.js <contentDir> <cacheDir> <siteName>");
+  process.exit(1);
+}
+
+await generateOgImages(contentDir, cacheDir, siteName);
diff --git a/lib/og.js b/lib/og.js
index fdffe94..59fefc1 100644
--- a/lib/og.js
+++ b/lib/og.js
@@ -288,6 +288,7 @@ export async function generateOgImages(contentDir, cacheDir, siteName) {
   let generated = 0;
   let skipped = 0;
   const newManifest = {};
+  const SAVE_INTERVAL = 10;
 
   for (const filePath of mdFiles) {
     const raw = readFileSync(filePath, "utf8");
@@ -320,6 +321,11 @@ export async function generateOgImages(contentDir, cacheDir, siteName) {
     writeFileSync(join(ogDir, `${slug}.png`), pngBuffer);
     newManifest[slug] = { title: slug, hash };
     generated++;
+
+    // Save manifest periodically to preserve progress
+    if (generated % SAVE_INTERVAL === 0) {
+      writeFileSync(manifestPath, JSON.stringify(newManifest, null, 2));
+    }
   }
 
   writeFileSync(manifestPath, JSON.stringify(newManifest, null, 2));