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I wonder how Acme[0][1], developed by Rob Pike for Plan 9 would compare. It feels fast and light, but I only ever use it for files lighter than a megabyte.

[0]: http://acme.cat-v.org/ [1]: https://github.com/9fans/plan9port

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It opens a ~190 MB JSON file[0] in about 2 seconds on my machine. Scrolling and jumping around the file feels very smooth. Editing is also crisp. Writing the file back to disk takes about as long as opening it.

[0]: https://github.com/zemirco/sf-city-lots-json

For test.xml the RSS is 20MB and opening it and going to the last character is instantaneous, search and replace on test.xml takes slightly less than one second.

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