Other Safari “experimental features”

[AppleSmurf]

Does anyone know what the majority of these are? If so which are the best for speed and privacy?

 

[!!!]

They're for web devs to test out new features. The best for security and privacy is to disable all of them, as they might contain bugs that can be exploited.

 

[Spetsgruppa]

They're for web devs to test out new features. The best for security and privacy is to disable all of them, as they might contain bugs that can be exploited.

I went over to check and turns out there are some of them turned on. So should i just turn them all off?