diff --git a/src/WebTelemetryBase.ts b/src/WebTelemetryBase.ts
index 7e196a6..8bc147d 100644
--- a/src/WebTelemetryBase.ts
+++ b/src/WebTelemetryBase.ts
@@ -78,6 +78,17 @@ export abstract class WebTelemetryBase<P, R> {
         this.callTransport([...this.events]);
     }
 
+    protected flushBufferedEvents() {
+        clearTimeout(this.timer);
+
+        if (!this.events.length) {
+            return;
+        }
+
+        this.sendHandler();
+        this.events = [];
+    }
+
     /**
      * Планирует отправку данных на сервер
      */
diff --git a/src/presets/WebTelemetryResources.spec.ts b/src/presets/WebTelemetryResources.spec.ts
index 6be2dae..ba226a9 100644
--- a/src/presets/WebTelemetryResources.spec.ts
+++ b/src/presets/WebTelemetryResources.spec.ts
@@ -1,8 +1,113 @@
-import { describe, it, expect } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
-import { validatePerformanceEntry, VIDEO_URLs } from './WebTelemetryResources.js';
+import { WebTelemetryResources, validatePerformanceEntry, VIDEO_URLs } from './WebTelemetryResources.js';
+
+type ResourceEntry = PerformanceEntry & {
+    toJSON(): Record<string, string | number>;
+};
+
+class MockPerformanceObserver {
+    static instance: MockPerformanceObserver | undefined;
+    static bufferedEntries: PerformanceEntry[] = [];
+
+    disconnected = false;
+    private callback: PerformanceObserverCallback;
+    private records: PerformanceEntry[] = [];
+
+    constructor(callback: PerformanceObserverCallback) {
+        this.callback = callback;
+        MockPerformanceObserver.instance = this;
+    }
+
+    observe(options: PerformanceObserverInit) {
+        if (options.type === 'resource' && options.buffered) {
+            this.records.push(...MockPerformanceObserver.bufferedEntries);
+            MockPerformanceObserver.bufferedEntries = [];
+        }
+    }
+
+    disconnect() {
+        this.disconnected = true;
+    }
+
+    takeRecords() {
+        const records = [...this.records];
+        this.records = [];
+        return records;
+    }
+
+    emit(entries: PerformanceEntry[]) {
+        if (this.disconnected) {
+            return;
+        }
+
+        const entryList = {
+            getEntries: () => entries,
+            getEntriesByName: () => [],
+            getEntriesByType: (type: string) => (type === 'resource' ? entries : []),
+        } as PerformanceObserverEntryList;
+
+        this.callback(entryList, this as unknown as PerformanceObserver);
+    }
+
+    queue(entries: PerformanceEntry[]) {
+        this.records.push(...entries);
+    }
+}
+
+const originalPerformanceObserver = window.PerformanceObserver;
+
+function setPerformanceObserver(value: typeof PerformanceObserver | undefined) {
+    Object.defineProperty(window, 'PerformanceObserver', {
+        configurable: true,
+        writable: true,
+        value,
+    });
+}
+
+function setReadyState(value: DocumentReadyState) {
+    Object.defineProperty(document, 'readyState', {
+        configurable: true,
+        value,
+    });
+}
+
+function createResourceEntry(name: string, values: Record<string, string | number> = {}): ResourceEntry {
+    return {
+        name,
+        entryType: 'resource',
+        startTime: 0,
+        duration: 0,
+        toJSON: () => ({
+            name,
+            entryType: 'resource',
+            ...values,
+        }),
+    } as ResourceEntry;
+}
+
+async function flushMicrotasks() {
+    await Promise.resolve();
+    await Promise.resolve();
+    await Promise.resolve();
+    await Promise.resolve();
+}
 
 describe('presets', () => {
+    beforeEach(() => {
+        MockPerformanceObserver.instance = undefined;
+        MockPerformanceObserver.bufferedEntries = [];
+        setPerformanceObserver(MockPerformanceObserver as unknown as typeof PerformanceObserver);
+        (WebTelemetryResources as unknown as { observer?: PerformanceObserver }).observer = undefined;
+    });
+
+    afterEach(() => {
+        vi.useRealTimers();
+        Reflect.deleteProperty(document, 'readyState');
+        setPerformanceObserver(originalPerformanceObserver);
+        (WebTelemetryResources as unknown as { observer?: PerformanceObserver }).observer = undefined;
+    });
+
     describe('WebTelemetryResources:validatePerformanceEntry', () => {
         const firstBlackList = [
             /api\.amplitude\.com/,
@@ -59,4 +164,95 @@ describe('presets', () => {
             expect(mixedEntres.filter(validator)).toEqual(desiredEntres);
         });
     });
+
+    describe('WebTelemetryResources:document ready', () => {
+        it('flushes collected resources on load and stops further observation', async () => {
+            vi.useFakeTimers();
+            setReadyState('loading');
+
+            const send = vi.fn();
+            const telemetry = new WebTelemetryResources(
+                'test-project',
+                {
+                    projectName: 'test-project-resources',
+                    endpoint: 'https://telemetry.example.com',
+                    delay: 1_000,
+                    buffSize: 10,
+                    debug: false,
+                },
+                [{ send }],
+            );
+
+            telemetry.start();
+
+            const observer = MockPerformanceObserver.instance;
+
+            expect(observer).toBeDefined();
+
+            observer?.emit([createResourceEntry('https://static.example.com/app.js', { duration: 21 })]);
+            await flushMicrotasks();
+
+            observer?.queue([createResourceEntry('https://static.example.com/app.css', { duration: 31 })]);
+
+            expect(send).not.toHaveBeenCalled();
+
+            setReadyState('complete');
+            window.dispatchEvent(new Event('load'));
+            await flushMicrotasks();
+
+            expect(observer?.disconnected).toBe(true);
+            expect(send).toHaveBeenCalledTimes(1);
+
+            const payload = JSON.parse(send.mock.calls[0][0]);
+
+            expect(payload).toHaveLength(2);
+            expect(payload.map((entry: { name: string }) => entry.name)).toEqual([
+                'https://static.example.com/app.js',
+                'https://static.example.com/app.css',
+            ]);
+
+            vi.advanceTimersByTime(1_000);
+            await flushMicrotasks();
+
+            expect(send).toHaveBeenCalledTimes(1);
+
+            observer?.emit([createResourceEntry('https://static.example.com/late.js', { duration: 12 })]);
+            await flushMicrotasks();
+
+            expect(send).toHaveBeenCalledTimes(1);
+        });
+
+        it('flushes buffered resources immediately when started after document ready', async () => {
+            setReadyState('complete');
+            MockPerformanceObserver.bufferedEntries = [
+                createResourceEntry('https://static.example.com/font.woff2', { duration: 14 }),
+            ];
+
+            const send = vi.fn();
+            const telemetry = new WebTelemetryResources(
+                'test-project',
+                {
+                    projectName: 'test-project-resources',
+                    endpoint: 'https://telemetry.example.com',
+                    delay: 1_000,
+                    buffSize: 10,
+                    debug: false,
+                },
+                [{ send }],
+            );
+
+            telemetry.start();
+            await flushMicrotasks();
+
+            const observer = MockPerformanceObserver.instance;
+
+            expect(observer?.disconnected).toBe(true);
+            expect(send).toHaveBeenCalledTimes(1);
+
+            const payload = JSON.parse(send.mock.calls[0][0]);
+
+            expect(payload).toHaveLength(1);
+            expect(payload[0].name).toBe('https://static.example.com/font.woff2');
+        });
+    });
 });
diff --git a/src/presets/WebTelemetryResources.ts b/src/presets/WebTelemetryResources.ts
index 2cf724d..e36ecbd 100644
--- a/src/presets/WebTelemetryResources.ts
+++ b/src/presets/WebTelemetryResources.ts
@@ -59,6 +59,12 @@ export class WebTelemetryResources extends WebTelemetryBase<WebTelemetryResource
     private static observer: PerformanceObserver | undefined;
     private validatePerformanceEntry;
     private isObservationStarted: boolean = false;
+    private isObservationContinuedAfterLoad: boolean = false;
+    private isFinalized: boolean = false;
+
+    private readonly onDocumentReady = () => {
+        void this.finalizeAfterDocumentReady();
+    };
 
     constructor(name: string, config: WebTelemetryResourcesConfig, transports?: Array<WebTelemetryTransport>) {
         super(config, [], transports);
@@ -68,6 +74,7 @@ export class WebTelemetryResources extends WebTelemetryBase<WebTelemetryResource
             config.resourcesBlackList || [],
         );
         this.name = name;
+        this.isObservationContinuedAfterLoad = config.observeAfterLoad ?? false;
 
         const handler = this.handler.bind(this);
 
@@ -77,38 +84,82 @@ export class WebTelemetryResources extends WebTelemetryBase<WebTelemetryResource
     }
 
     private handler(entryList: PerformanceObserverEntryList) {
-        if (this.config.disabled) {
+        if (this.config.disabled || this.isFinalized) {
             return;
         }
 
-        const resources = entryList.getEntriesByType('resource').filter(this.validatePerformanceEntry);
-        for (const res of resources) {
-            /**
-             * Эта проверка необходима чтобы `PerformanceObserver` не тригерился
-             * на отправку данных в бекенд. Если этого не сделать, то шедулер будет
-             * бесконечно планировать отправку данных после любой отправки данных
-             */
-            if (res.name && this.config.endpoint && res.name.includes(this.config.endpoint)) {
-                continue;
-            }
+        void this.processResources(entryList.getEntriesByType('resource'));
+    }
 
-            const resData = res.toJSON ? res.toJSON() : {};
+    private shouldSkipResource(res: PerformanceEntry) {
+        /**
+         * Эта проверка необходима чтобы `PerformanceObserver` не тригерился
+         * на отправку данных в бекенд. Если этого не сделать, то шедулер будет
+         * бесконечно планировать отправку данных после любой отправки данных
+         */
+        return Boolean(res.name && this.config.endpoint && res.name.includes(this.config.endpoint));
+    }
 
-            const evt: WebTelemetryResourcesData = {
-                hostname: window.location.hostname,
-                project: this.name,
-                path: window.location.href,
-            };
+    private createResourcePayload(res: PerformanceEntry) {
+        const resData = res.toJSON ? res.toJSON() : {};
 
-            for (const entryName of FIELDS_TO_EXTRACT) {
-                const value = resData[entryName];
-                if (value) {
-                    evt[entryName] = typeof value === 'number' ? Math.round(value) : value;
-                }
+        const evt: WebTelemetryResourcesData = {
+            hostname: window.location.hostname,
+            project: this.name,
+            path: window.location.href,
+        };
+
+        for (const entryName of FIELDS_TO_EXTRACT) {
+            const value = resData[entryName];
+            if (value) {
+                evt[entryName] = typeof value === 'number' ? Math.round(value) : value;
             }
+        }
 
-            this.push(evt);
+        return evt;
+    }
+
+    private async processResources(resources: PerformanceEntry[]) {
+        if (this.config.disabled) {
+            return;
         }
+
+        const createdEvents = await Promise.all(
+            resources
+                .filter(this.validatePerformanceEntry)
+                .filter((entry) => !this.shouldSkipResource(entry))
+                .map((entry) => this.createEvent(this.createResourcePayload(entry))),
+        );
+
+        if (!createdEvents.length) {
+            return;
+        }
+
+        this.events.push(...createdEvents);
+        this.scheduleSend();
+    }
+
+    private removeDocumentReadyListener() {
+        window.removeEventListener('load', this.onDocumentReady);
+    }
+
+    private async finalizeAfterDocumentReady() {
+        if (this.isFinalized) {
+            return;
+        }
+
+        this.isFinalized = true;
+        this.removeDocumentReadyListener();
+
+        if (WebTelemetryResources.observer && this.isObservationStarted) {
+            const bufferedEntries = WebTelemetryResources.observer.takeRecords();
+            WebTelemetryResources.observer.disconnect();
+            this.isObservationStarted = false;
+
+            await this.processResources(bufferedEntries);
+        }
+
+        this.flushBufferedEvents();
     }
 
     payloadToJSON(payload: WebTelemetryResourcesData) {
@@ -116,7 +167,7 @@ export class WebTelemetryResources extends WebTelemetryBase<WebTelemetryResource
     }
 
     public start() {
-        if (this.isObservationStarted) {
+        if (this.isObservationStarted || this.isFinalized) {
             return;
         }
         try {
@@ -126,13 +177,27 @@ export class WebTelemetryResources extends WebTelemetryBase<WebTelemetryResource
                     buffered: true,
                 });
                 this.isObservationStarted = true;
+
+                if (document.readyState === 'complete') {
+                    if (!this.isObservationContinuedAfterLoad) {
+                        void this.finalizeAfterDocumentReady();
+                    }
+                    return;
+                }
+
+                if (!this.isObservationContinuedAfterLoad) {
+                    window.addEventListener('load', this.onDocumentReady, { once: true });
+                }
             }
             // eslint-disable-next-line no-empty
         } catch (_e) {}
     }
 
     public end() {
+        this.removeDocumentReadyListener();
+
         if (WebTelemetryResources.observer) {
+            this.flushBufferedEvents();
             WebTelemetryResources.observer.disconnect();
             this.isObservationStarted = false;
         }
diff --git a/src/types.ts b/src/types.ts
index e9a843a..5608a9a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -84,9 +84,16 @@ type ResourcesBlackList = {
     resourcesBlackList?: RegExp[];
 };
 
-export type WebTelemetryResourcesConfig = WebTelemetryConfig & ResourcesBlackList;
+type ResourcesObservationOptions = {
+    /**
+     * Продолжать наблюдение за ресурсами после загрузки документа
+     */
+    observeAfterLoad?: boolean;
+};
+
+export type WebTelemetryResourcesConfig = WebTelemetryConfig & ResourcesBlackList & ResourcesObservationOptions;
 
-export type WebTelemetryExtendedConfig = WebTelemetryConfig & ResourcesBlackList;
+export type WebTelemetryExtendedConfig = WebTelemetryConfig & ResourcesBlackList & ResourcesObservationOptions;
 
 export type WindowWithAssistant = Window &
     AssistantWindow & {