In short, these are the fastest themes for WordPress:
GeneratePress Lightweight Theme - a very lightweight theme and one that’s specially built to make your site as fast as possible. One of the reasons why this theme is lightning fast is because it’s built so it doesn't need Jquery (you can build a site without necessarily relying on Jquery). It renders fast which is also great news for Google Pagespeed Insights.
WP-Astra Theme - another super-fast theme with additional prebuilt child theme options that’ll suit almost any type of business.
Neve by Themeisle - the Neve theme was also conceived with speed in mind, and it definitely deserves its place among the fastest WordPress themes out there. Like the others on our list so far, this one also doesn’t rely on Jquery and sports some special features that can significantly boost conversion rates for WooCommerce users.
Also, it’s worth mentioning that the designers have made sure to include a bunch of beautiful pre-built templates.
OceanWP - another fast theme for your WordPress site which deserves its place among the top five here without a doubt. If you want to build a pretty-looking site that’ll work flawlessly, then this is the theme for you.