On the parallel-programming tag, I would like to suggest the synonyms parallel and parallel-processing. Initially I couldn't do so because my score was less than 5 in the tag. 20 minutes ago I dutifully acquired the score by adding the tag to a (valid) parallel programming question I'd answered in the past.
I'm still not allowed to propose any synonyms, but my user page correctly reports my score as 18 in this tag.
Is there a built-in delay after retagging, before synonyms are allowed (perhaps to prevent synonym spamming)? If so, how long is the delay?
Or am I missing something else obvious?