Let's go with emojis in Slack. That was not an issue in any chat sowftware offering them decades ago. In 2020 I can't have them enabled on MacBook Pro, because

Let's go with emojis in Slack. That was not an issue in any chat sowftware offering them decades ago. In 2020 I can't have them enabled on MacBook Pro, because if someone were to use many of them, the CPU usage would spike (A LOT), even on background. Since this has been the case for at least three years now, I don't consider it a random bug, but rather an issue with the technologies used. As mentioned in a reply bellow, syntax highlighting is a feature that was (and is) blazingly fast in every software except atom-based editors. Startup times are atrocious too. Spotify. And as mentioned in my comment, speed can be influenced by the size or memory requirements. And that becomes issue on its own when you want to use multiple of these applications. I constantly run into full ram and swapping with 16GB. Mostly caused by web applications, but the root cause is the same. Size on disk (or when updating) also matters on phones a lot.