When uploading a video, if the browser memory usage is very high, it may be because the uploaded video file is too large and takes up a lot of memory. You can try the following methods to reduce the memory usage:

1. Compress the video file: Compress the video file into a smaller file size and then upload it to Youku, which can reduce the browser memory usage.

2. Use Youku Upload Assistant: When uploading a video, use Youku Upload Assistant instead of uploading the file directly with your browser, which can effectively reduce the memory usage.

3. Upgrade your browser: If you have an older browser version, it may cause high memory usage when uploading videos, try upgrading your browser to the latest version.

4. Close other programs: When uploading videos, close other unnecessary programs to free up your computer resources.

5. Increase memory: If you need to upload large video files frequently, you may also want to consider increasing your computer's memory to improve performance and upload speed.