There could be several reasons why Apple Podcasts is running slow on your device. Here are some potential reasons and solutions:

1. Internet Connection: Slow internet connection can cause buffering or slow loading. Make sure you have a good internet connection.

2. App Updates: If you haven't updated the app in a while, it may cause performance issues. Always keep your apps updated to the latest version.

3. Device Storage: If your device is running out of storage, it can slow down the performance of your apps. Try to free up some space.

4. App Cache: Over time, apps accumulate cache which can slow them down. Try clearing the cache of the Apple Podcasts app.

5. Background Apps: If you have many apps running in the background, they can slow down the performance of other apps. Close unnecessary apps running in the background.

6. iOS Version: If your device's iOS version is outdated, it can cause performance issues. Make sure your device is updated to the latest iOS version.

If none of the above solutions work, you can try uninstalling and reinstalling the app. If the problem persists, you may want to contact Apple support for further assistance.