To download performance data from a business TikTok account, follow these steps:

1. Open the TikTok app and log in to your business account.
2. Tap on the "Profile" icon at the bottom right corner of the screen.
3. On your profile page, tap on the three horizontal dots at the top right corner to access the settings.
4. In the settings menu, tap on "Manage account".
5. Scroll down and tap on "Analytics".
6. Here, you can find various analytics related to your TikTok account, including video views and engagement metrics.
7. To download the analytics, tap on the "Export data" button or similar option available in the analytics section.
8. Follow the on-screen instructions to download the analytics report.