Double quotes ARE slower because of the restrictions they impose, but they are only slower if it actualy contains something that needs escaped.
Indeed, but let's go back to where it all started, shall we? Here's what the OP wrote:
On occasions such as those when you don't care about the special properties of either single or double quotes, which is the best to use.
Which to me means, the OP is talking about strings which don't have characters that are special - where the syntax of having single or double quotes doesn't matter. Obviously, if you have scalar or array sigils, or backslashes, the special properties of single or double quotes do matter - and are not the occasions we are talking about.
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