Digital vibrance, is not supported by OS X its self.. so it cannot be modifyed to get it work. Don't bother to get it work, cause you'll (probably) never manage to get that working.
YouTube videos loading lags in Safari
Open Terminal (in /Applications/Utilities)
Execute the Terminal command below to disable DNS prefetching:
defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean false
Quit Safari, then open it again and test for the issue.
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