While games often do much more work per frame than “typical” applications, they’re also much better optimized than “typical” applications. Keypress-to-display measurements are mostly done in games because gamers care more about latency than most people, but I don’t think that most applications are all that different from games in terms of latency. It’s possible to tune things to get into the 40ms range, but the vast majority of users don’t do that kind of tuning, and even if they do, that’s still quite far from the 10ms to 20ms range, where tablets and VR start to feel really “right”. Note that this assumes a gaming mouse and a pretty decent LCD it’s common to see substantially slower latency for the mouse and for pixel switching. 16.6 (frame caching inside of the display).16.6 (GPU is rendering the previous frame, current frame is cached).
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The idea that computers respond quickly to input, so quickly that humans can’t notice the latency, is the most common performance-related fallacy I hear from professional programmers. People often tell me that’s true, but I think it’s just the opposite. One reason might be that keyboard and mouse input are quick and that inputs are reflected nearly instantaneously, but I don’t think that’s true. 20ms feels fine, 50ms feels laggy, and 150ms feels unbearable.Ĭuriously, I rarely hear complaints about keyboard and mouse input being slow. You can also see something similar if you try VR headsets with different latencies.
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The Apple device has well above 10ms end-to-end latency, but the difference is still quite dramatic - it’s enough that I’ll actually use the new iPad Pro to take notes or draw diagrams, whereas I find Android tablets unbearable as a pen-and-paper replacement. the current generation iPad Pro with the Apple stylus. If you want to see a mini version of this for yourself, you can try a random Android tablet with a stylus vs. At 10ms (1/100th of a second), the latency is noticeable, but the experience is ok, and at < 1ms the experience is great, as good as pen and paper. At 100ms (1/10th of a second), which is typical of consumer tablets, the experience is terrible. If you don’t want to watch the three minute video, they basically created a device which could simulate arbitrary latencies down to a fraction of a millisecond. There’s a great MSR demo from 2012 that shows the effect of latency on the experience of using a tablet. Open up iTerm2 preferences (⌘ + ,) -> Profiles -> Keys -> Click on + icon (add new Keyboard shortcut).Terminal latency Terminal latency | I'm trying some experimental tiers on Patreon to see if I can get to substack-like levels of financial support for this blog without moving to substack! iTerm is not set up to work with these shortcuts by default but here's how you set them up: You might be familiar with shortcuts to skip a word (⌥) or go to start/end of the line (⌘).
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Source Code Pro can be downloaded using Homebrew brew tap homebrew/cask-fonts & brew install -cask font-source-code-pro Change the font to 14pt Source Code Pro Lite.Change the cursor text and cursor color to yellow make it more visible.
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Download one of iTerm2 color schemes and then set these to your default profile colors.Go to profiles -> Default -> Terminal -> Check silence bell to disable the terminal session from making any sound.Set hot-key to open and close the terminal to command + option + i.Here are some suggested settings you can change or set, they are all optional. Use Homebrew to download and install: brew install -cask iterm2 It's highly customizable and comes with a lot of useful features. ITerm2 is an open source replacement for Apple's Terminal.
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