Move the initPermutive call

src/experiments/tests/move-permutive-segmentation.ts

@@ -0,0 +1,29 @@
+import type { ABTest } from '@guardian/ab-core';
+
+export const movePermutiveSegmentation: ABTest = {
+	id: 'MovePermutiveSegmentation',
+	author: '@commercial-dev',
+	start: '2025-01-14',
+	expiry: '2025-02-28',
+	audience: 0 / 100,
+	audienceOffset: 20 / 100,
+	audienceCriteria: '',
+	successMeasure: '',
+	description:
+		'Measure the performance impact of moving the initialisation of Permutive segmentation.',
+	variants: [
+		{
+			id: 'control',
+			test: (): void => {
+				/* no-op */
+			},
+		},
+		{
+			id: 'variant',
+			test: (): void => {
+				/* no-op */
+			},
+		},
+	],
+	canRun: () => true,
+};

src/init/consented-advertising.ts

@@ -1,3 +1,5 @@
+import { isUserInVariant } from '../experiments/ab';
+import { movePermutiveSegmentation } from '../experiments/tests/move-permutive-segmentation';
 import { init as prepareAdVerification } from '../lib/ad-verification/prepare-ad-verification';
 import { bootCommercial } from '../lib/commercial-boot-utils';
 import { adFreeSlotRemove } from './consented/ad-free-slot-remove';
@@ -9,6 +11,7 @@ import { init as initIpsosMori } from './consented/ipsos-mori';
 import { init as initMessenger } from './consented/messenger';
 import { init as prepareA9 } from './consented/prepare-a9';
 import { init as prepareGoogletag } from './consented/prepare-googletag';
+import { initPermutive } from './consented/prepare-permutive';
 import { init as preparePrebid } from './consented/prepare-prebid';
 import { removeDisabledSlots as closeDisabledSlots } from './consented/remove-slots';
 import { initTeadsCookieless } from './consented/teads-cookieless';
@@ -34,7 +37,10 @@ const commercialModules = [
 	reloadPageOnConsentChange,
 	preparePrebid,
 	initDfpListeners,
-	prepareGoogletag,
+	// add test to determine impact of moving initPermutive
+	isUserInVariant(movePermutiveSegmentation, 'variant')
+		? prepareGoogletag
+		: () => initPermutive().then(prepareGoogletag),
 	initDynamicAdSlots,
 	prepareA9,
 	initFillSlotListener,

src/init/consented/static-ad-slots.ts

@@ -3,6 +3,7 @@ import { createAdvert } from '../../define/create-advert';
 import { displayAds } from '../../display/display-ads';
 import { displayLazyAds } from '../../display/display-lazy-ads';
 import { isUserInVariant } from '../../experiments/ab';
+import { movePermutiveSegmentation } from '../../experiments/tests/move-permutive-segmentation';
 import { mpuWhenNoEpic } from '../../experiments/tests/mpu-when-no-epic';
 import type { SizeMapping } from '../../lib/ad-sizes';
 import { adSizes, createAdSize } from '../../lib/ad-sizes';
@@ -62,12 +63,14 @@ const fillStaticAdvertSlots = async (): Promise<void> => {
 	// This module has the following strict dependencies. These dependencies must be
 	// fulfilled before this function can execute reliably. The bootstrap
 	// initiates these dependencies, to speed up the init process. Bootstrap also captures the module performance.
-	const dependencies: Array<Promise<void>> = [
-		removeDisabledSlots(),
+	const dependencies: Array<Promise<void>> = [removeDisabledSlots()];
+
+	// add test to determine impact of moving initPermutive
+	if (isUserInVariant(movePermutiveSegmentation, 'variant')) {
 		// Permutive segmentation init code must run before googletag.enableServices() is called
 		/** @see https://support.permutive.com/hc/en-us/articles/360011779239-Deploying-the-Permutive-JavaScript-Tag */
-		initPermutive(),
-	];
+		dependencies.push(initPermutive());
+	}
 
 	await Promise.all(dependencies);