WebAssembly SIMD is an experimental web feature that can be used to increase computational speeds in the browser. For Pelica, it can especially be used to make video exports about 2 times faster.
As of now, it's only available in Chromium based browsers such as Google Chrome.
1. Head to chrome://flags in your web browser.
2. In the search bar at the top, type "simd". You should then see the "WebAssembly SIMD support" entry.
3. Use the menu at the right to enable support.
4. If instructed, restart your browser.