Performance problem

[fresheneesz]

I'm trying to compare two strings, one of which is moderately long, and its taking foreeeeever to process. This particular diff is pretty simple (just a long appended string on a much shorter string), so I'm surprised it takes more than a split second. But maybe this is indicative of other issues with the algorithm?

I'm doing a diffWordsWithSpace on the following, and it takes 24 seconds to process:

"Hello"
vs:
"Hello
Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
https://static.doubleclick.net/instream/ad_status.js Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
https://www.facebook.com/tr/?id=1809232889294748&ev=PageView&dl=https%3A%2F…%2Fticket%2F573c1312b537ff9e09f455ff&rl=&if=false&ts=1485747369056&v=2.5.1 Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
https://googleads.g.doubleclick.net/pagead/id Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
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https://googleads.g.doubleclick.net/pagead/id Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
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DevTools failed to parse SourceMap: https:///css/bootstrap.css.map
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"

[tma02]

I found much better performance with larger strings though the JS version of this library: https://code.google.com/p/google-diff-match-patch/
mirrored here:
https://github.com/lqc/google-diff-match-patch
I actually ran the exact same diff as above and found that google-diff-match-patch was able to do it in 0.001s
Is there a way to implement the algorithm they're using in jsdiff?

[sjungwirth]

Also see https://www.npmjs.com/package/diff-match-patch

[hperrin]

I'm hitting this issue on a diff between two ~3kb strings. Browser tab essentially freezes and must be killed with the browser's task manager. (Roughly 90% of the lines between the two strings are changed.)

[ExplodingCabbage]

Hmm. Very interesting! According to its README, diff-match-patch uses the preprocessing optimisations listed at https://neil.fraser.name/writing/diff/, one of which (the "Singular Insertion/Deletion" optimisation) should let it handle this case instantly.

Probably we should do that. I think there's another optimisation possible that would ALSO make this case fast: once we've reached either edge of the edit graph on some diagonal, we no longer need to consider diagonals further out ever again, and we can use this to constrain how many iterations our main for (let diagonalPath = -1 * editLength; diagonalPath <= editLength; diagonalPath += 2). Adding this optimisation should instantly transform this particular example from taking O(n^2) time to O(n) time. I don't think this optimisation is proposed in Myers' paper - I should check - but thinking through this example makes it extraordinarily obvious that any Myers diff implementation should do this!

[ExplodingCabbage]

#448 makes this instant.