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Update changelog and add some performance comparisons
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@ -4,12 +4,21 @@ Changelog
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version 0.4.0 [future]
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-----------------------
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- Refactor kitty's internals to make it even faster and more efficient. The
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CPU usage of kitty + X server while doing intensive tasks such as scrolling
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a file continuously in less has been reduced by 50%. There are now two
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- Support for drawing arbitrary raster graphics (images) in the terminal via a
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new graphics protocol. kitty can draw images with full 32-bit color over both
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ssh connections and files/shared memory (when available) for better
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performance. The drawing primitives support alpha blending and z-index.
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Images can be draw both above and below text. See
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https://github.com/kovidgoyal/kitty/blob/master/graphics-protocol.asciidoc
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for details.
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- Refactor kitty's internals to make it even faster and more efficient. The CPU
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usage of kitty + X server while doing intensive tasks such as scrolling a
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file continuously in less has been reduced by 50%. There are now two
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configuration options ``repaint_delay`` and ``input_delay`` you can use to
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fine tune kitty's performance vs CPU usage profile. The CPU usage of kitty
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+ X when scrolling in less is now better than most (all?) other terminals.
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fine tune kitty's performance vs CPU usage profile. The CPU usage of kitty +
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X when scrolling in less is now significantly better than most (all?) other
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terminals. See https://github.com/kovidgoyal/kitty#performance
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- Hovering over URLs with the mouse now underlines them to indicate they
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can be clicked. Hold down Ctrl+Shift while clicking to open the URL.
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@ -316,6 +316,29 @@ that and perform the task you want to analyse, for example, scrolling a large
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file with `less`. After you quit, function call statistics will be printed to
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`stdout` and you can use tools like *kcachegrind* for more detailed analysis.
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Here are some CPU usage numbers for the task of scrolling a file continuously in less.
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The CPU usage is for the terminal process and X together and is measured using htop.
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The measurements are taken at the same font and window size for all terminals on a
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`Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz` CPU with a
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`Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X]` GPU.
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|===
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| Terminal | CPU usage (X + terminal)
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| kitty | 6 - 8%
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| xterm | 5 - 7% (but scrolling was extremely janky)
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| termite | 10 - 13%
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| urxvt | 12 - 14%
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| gnome-terminal | 15 - 17%
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| konsole | 29 - 31%
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|===
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As you can see, kitty uses much less CPU than all terminals, except xterm, but
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its scrolling "smoothness" is much better than that of xterm (at least to my,
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admittedly biased, eyes).
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== Note for Linux/macOS packagers
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While kitty does use python, it is not a traditional python package, so please do not install it in site-packages.
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