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Okay, just as a counterpoint, I opened 2 10,000 line files and tried to do a diff between them in VSCode. It took more than 20 seconds?

Yes, it breaks workflow and is incredibly slow.

Just like refreshing elements in UI shouldn't take multiple seconds, or a webpage shouldn't take multiple seconds to load on a good connection.

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I tried the same in my Linux terminal emulator, and it took 0.2s, when I added colors, 0.3s. That's 100x faster - maybe diff in VSCode means something different than running diff and printing the output? Did you include the time needed to open the files?

Yes, the files themselves open quite quickly, but I will admit that it's a complicated diff (lots of expected differences), and VSCode is not primarily a diff tool.

But also 10k line file should be nothing for a modern PC.

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