Claude App Lagging or Freezing? How to Fix Performance

When using the Claude.ai web interface, you may experience severe typing lag, browser tab freezing, or slow response times. While these performance drops are sometimes caused by backend server degradation at Anthropic, they are often triggered by local browser resource exhaustion, particularly during long chat sessions.

Because Claude renders complex markdown, code syntax highlighting, and conversational history in real-time, long threads place a significant rendering burden on your browser's JavaScript engine. This guide walk you through identifying whether the bottleneck is on Anthropic's servers or your local machine, and how to restore smooth performance.

Step 1: Determine If It Is a Server-Side Degradation Before troubleshooting your local browser, rule out an active Anthropic infrastructure issue. When Anthropic experiences high load, they may throttle database read/write speeds, leading to UI lag.

1. Visit the official status page at status.anthropic.com.
2. Look for "Degraded Performance" notices or active incidents on the "Claude.ai" web app component.
3. Check developer forums or community channels to see if other users are reporting typing latency or UI freezes at the same time.

If the status page indicates degraded performance, local troubleshooting will have limited success. You will need to wait for Anthropic to scale up server capacity.

Step 2: Start a New Chat Thread The primary driver of local browser lag in Claude is the size of the active chat database stored in your browser's temporary memory. As a conversation grows to tens of thousands of words, the browser must re-render the entire DOM structure with every new generation.

1. Locate the "Start New Chat" button in the top left corner of the Claude.ai interface (or press Ctrl + K / Cmd + K).
2. Start a fresh conversation with a clean prompt.
3. If you need information from your previous chat, copy only the essential context into your new prompt rather than continuing the old, bloated thread.

Starting a new chat instantly flushes the local rendering loop, which usually resolves typing lag and interface freezes immediately.

Step 3: Clear Claude's Local Storage and Site Data Corrupted cached data, active service workers, or outdated site data stored in your browser can cause the Claude interface to hang or consume 100% of your CPU.

On Google Chrome or Brave: 1. Open Claude.ai in your browser. 2. Click the tune icon (settings slider) or padlock icon to the left of the URL in the address bar. 3. Select Site settings. 4. Click Clear data under the Usage section. 5. Reload the page and log back into your account.

On Mozilla Firefox: 1. Click the padlock icon next to the URL. 2. Select Clear cookies and site data... 3. Click Remove. 4. Refresh the tab.

Step 4: Disable Hardware Acceleration and Extensions Certain web browser extensions—especially ad blockers, page translators, and grammar assistants—intercept the text stream coming from Claude's websockets. This constant interception causes severe visual lag.

1. Open your browser's Extension menu (usually found via the puzzle piece icon or under settings).
2. Temporarily toggle off any writing assistants (like Grammarly), translation extensions, or aggressive ad blockers.
3. Reload Claude and test typing in the input box.
4. Additionally, verify that Hardware Acceleration is enabled in your browser settings (under System/Performance) to ensure your system's GPU is assisting with text rendering.

When to escalate If you have cleared your site data, confirmed that your computer has free CPU/RAM, tried a brand-new chat thread, and tested other web browsers with no improvement, you may be experiencing a localized account bug or a silent regional CDN outage. Contact Anthropic Support through the chat widget on the main support site (`support.anthropic.com`) to report the persistent performance degradation on your account profile.