Disable Search Indexing in options. It uses a buggy piece of garbage called Akonadi in the background and was causing one core of my CPU to stay at 100% for no reason.
Hmm. Maybe it's all a coincidence. When one of my CPU cores was stuck at 100%, I opened htop and configured it to show kernel threads too. I spotted MariaDB running in the background. I thought "I don't remember installing MariaDB". Went to uninstall it with pacman, which said it's a dependency of Akonadi. After googling, I turned off Search Indexing and CPU usage dropped to zero. I'll keep an eye on it to see if the problem comes back.
Baloo is the file indexer for KDE. It has little or nothing to do with Akonadi.
Hmm. Maybe it's all a coincidence. When one of my CPU cores was stuck at 100%, I opened htop and configured it to show kernel threads too. I spotted MariaDB running in the background. I thought "I don't remember installing MariaDB". Went to uninstall it with pacman, which said it's a dependency of Akonadi. After googling, I turned off Search Indexing and CPU usage dropped to zero. I'll keep an eye on it to see if the problem comes back.