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100 no-op non-amend commits on a subtitle file with 6689 dialogue lines, with the undo limit set to 100: Without flyweight: No video open: Initial memory usage: 30.6 MB Final memory usage: 498.0 MB Elapsed time: 6.3 seconds Video open, using libass: Initial memory usage: 54.3 MB Final memory usage: 653.3 MB Elapsed time: 23.7 seconds With flyweight: No video open: Initial memory usage: 26.0 MB Final memory usage: 104.5 MB Elapsed time: 3.0 seconds Video open, using libass: Initial memory usage: 46.7 MB Final memory usage: 251.8 MB Elapsed time: 13.0 seconds No video open: Memory usage: -79% Time: -52% Video open: Memory usage: -61.5% Time: -45% 100 no-op amend commits on a line in the middle of a subtitle file with 6689 dialogue lines, with video open: Without flyweight: Initial memory usage: 48.2 MB Final memory usage: 182.3 MB Elapsed time: 22.3 seconds With flyweight: Initial memory usage: 39.8 MB Final memory usage: 165.8 MB Elapsed time: 13.8 seconds Note: The large jump in memory usage here is due to that the benchmark is blocking the main thread, so at the end there are ~100 video frames waiting to be displayed.