When I export my game to HTML5 there's significant audio lag. I don't get any latency when I play in the editor. I've looked around and apparently this is just an issue with Godot. Is anyone else experiencing this?

Are you using the current version of Godot (Godot 3.3.2)? I got this problem too but managed to fix it by updating Godot to its current version.

You might want to enable the "Threads" variant for the web export https://godotengine.org/article/godot-web-export-progress-report-4