diff --git a/packages/astro/src/content/types-generator.ts b/packages/astro/src/content/types-generator.ts
index d63afd8125..b2da3a9d9f 100644
--- a/packages/astro/src/content/types-generator.ts
+++ b/packages/astro/src/content/types-generator.ts
@@ -202,6 +202,7 @@ export async function createContentTypesGenerator({
 					fileUrl: event.entry,
 					contentEntryType,
 					fs,
+					invalidateCache: true,
 				});
 				if (!(collectionKey in contentTypes)) {
 					addCollection(contentTypes, collectionKey);
@@ -225,6 +226,7 @@ export async function createContentTypesGenerator({
 					fileUrl: event.entry,
 					contentEntryType,
 					fs,
+					invalidateCache: true,
 				});
 				if (contentTypes[collectionKey]?.[entryKey]?.slug !== changedSlug) {
 					setEntry(contentTypes, collectionKey, entryKey, changedSlug);
diff --git a/packages/astro/src/content/utils.ts b/packages/astro/src/content/utils.ts
index 2a9e416893..ba2a93f046 100644
--- a/packages/astro/src/content/utils.ts
+++ b/packages/astro/src/content/utils.ts
@@ -442,6 +442,7 @@ export async function getStringifiedLookupMap({
 	return JSON.stringify(filePathByLookupId);
 }
 
+const frontmatterSlugCache = new Map<string, string>();
 /**
  * Check for slug in content entry frontmatter and validate the type,
  * falling back to the `generatedSlug` if none is found.
@@ -453,6 +454,7 @@ export async function getEntrySlug({
 	contentEntryType,
 	fileUrl,
 	fs,
+	invalidateCache = false,
 }: {
 	fs: typeof fsMod;
 	id: string;
@@ -460,11 +462,16 @@ export async function getEntrySlug({
 	generatedSlug: string;
 	fileUrl: URL;
 	contentEntryType: Pick<ContentEntryType, 'getEntryInfo'>;
+	invalidateCache?: boolean;
 }) {
-	const { slug: frontmatterSlug } = await contentEntryType.getEntryInfo({
-		fileUrl,
-		contents: await fs.promises.readFile(fileUrl, 'utf-8'),
-	});
+	if (!frontmatterSlugCache.has(id) || invalidateCache) {
+		const { slug: frontmatterSlug } = await contentEntryType.getEntryInfo({
+			fileUrl,
+			contents: await fs.promises.readFile(fileUrl, 'utf-8'),
+		});
+		frontmatterSlugCache.set(id, frontmatterSlug);
+	}
+	const frontmatterSlug = frontmatterSlugCache.get(id);
 	return parseEntrySlug({ generatedSlug, frontmatterSlug, id, collection });
 }