I clicked the 'Edit' button but did not change anything of a confluence page, then published it and found a new version in page history, which showed nothing diff when I compared with the last version.
I am wondering why confluence adds new version since there's no change. Does this affect performance of confluence?
Confluence doesn't try to be clever when you make a change, it just accepts what you've posted as new.
This isn't quite as useless as you think - the information that you might have been thinking of editing a page and got as far as clicking edit tells us that there is current interest in the page.
As for performance, no significant effect, it's just one more version.
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