As of my last knowledge update in January 2022, here are ten lightweight and WordPress free themes that were popular for building a website. Keep in mind that the popularity and availability of themes can change, so it’s a good idea to check the WordPress free themes repository or the official theme websites for the most up-to-date information:
Astra: Astra is known for its speed and performance. It’s a highly customizable theme that works well for various types of websites.
GeneratePress: GeneratePress is a lightweight and responsive theme that focuses on speed and usability. It’s easy to customize and works well with page builders.
OceanWP: OceanWP is a versatile and lightweight theme suitable for different types of websites. It’s known for its fast loading times and compatibility with popular plugins.
Neve: Neve is a fast and customizable theme that integrates seamlessly with popular page builders like Elementor. It’s suitable for various types of websites.
Hestia: Hestia is a modern theme with a clean design. It’s suitable for small businesses, startups, and creative agencies. It integrates well with page builders.
ColorMag: ColorMag is a lightweight theme designed for news, magazines, and blogs. It comes with multiple color options and customization features.
Customify: Customify is a simple and lightweight theme that offers easy customization options. It’s compatible with popular page builders and supports WooCommerce.
Sydney: Sydney is a business-focused theme with a professional design. It offers customization options, including a full-screen slider and header image support.
Zakra: Zakra is a lightweight and flexible theme suitable for different types of websites. It comes with multiple starter templates and integrates well with page builders.
Twenty Twenty-One: Twenty Twenty-One is the default WordPress theme for 2021. It’s lightweight, designed for the block editor, and offers a clean and modern look.
Always check the official WordPress free themes repository for the latest information and to ensure the themes are still actively maintained and compatible with the latest WordPress version. Additionally, consider your specific website needs and customization requirements when choosing a theme.