diff --git a/packages/frontend/editor-ui/src/Interface.ts b/packages/frontend/editor-ui/src/Interface.ts
index 48305ff1c03..8c87681d5b7 100644
--- a/packages/frontend/editor-ui/src/Interface.ts
+++ b/packages/frontend/editor-ui/src/Interface.ts
@@ -79,6 +79,7 @@ declare global {
 					api_host?: string;
 					autocapture?: boolean;
 					disable_session_recording?: boolean;
+					advanced_disable_feature_flags?: boolean;
 					debug?: boolean;
 					bootstrap?: {
 						distinctID?: string;
diff --git a/packages/frontend/editor-ui/src/app/stores/posthog.store.test.ts b/packages/frontend/editor-ui/src/app/stores/posthog.store.test.ts
index ab55c56ca49..79094f9fb58 100644
--- a/packages/frontend/editor-ui/src/app/stores/posthog.store.test.ts
+++ b/packages/frontend/editor-ui/src/app/stores/posthog.store.test.ts
@@ -164,6 +164,30 @@ describe('Posthog store', () => {
 			);
 		});
 
+		it('disables client-side flag refetch when flags are bootstrapped', () => {
+			const posthog = usePostHog();
+			posthog.init({ test: 'variant' });
+
+			expect(window.posthog?.init).toHaveBeenCalledWith(
+				DEFAULT_POSTHOG_SETTINGS.apiKey,
+				expect.objectContaining({
+					advanced_disable_feature_flags: true,
+				}),
+			);
+		});
+
+		it('keeps client-side flag refetch when flags are not bootstrapped', () => {
+			const posthog = usePostHog();
+			posthog.init();
+
+			expect(window.posthog?.init).toHaveBeenCalledWith(
+				DEFAULT_POSTHOG_SETTINGS.apiKey,
+				expect.not.objectContaining({
+					advanced_disable_feature_flags: expect.anything(),
+				}),
+			);
+		});
+
 		it('should identify user', () => {
 			const posthog = usePostHog();
 			posthog.init();
diff --git a/packages/frontend/editor-ui/src/app/stores/posthog.store.ts b/packages/frontend/editor-ui/src/app/stores/posthog.store.ts
index 7cb765a8145..fe8d73c4cc9 100644
--- a/packages/frontend/editor-ui/src/app/stores/posthog.store.ts
+++ b/packages/frontend/editor-ui/src/app/stores/posthog.store.ts
@@ -189,6 +189,10 @@ export const usePostHog = defineStore('posthog', () => {
 				distinctID: distinctId,
 				featureFlags: evaluatedFeatureFlags,
 			};
+			// Flags are server-evaluated and bootstrapped; without this, identify()/group()
+			// in the loaded callback each trigger a billed /flags refetch of values the
+			// client already has.
+			options.advanced_disable_feature_flags = true;
 		}
 
 		window.posthog?.init(config.apiKey, {