Tahoe Electron Detector • furbo.orgElectron app (read: Slack, GitHub, Visual Studio Code, etc) are causing system wide lag in macOS Tahoe, because electron framework override some private API.The override is use to mask and paint rounded corner, and causing the macOS’ WindowServer to repaint the window all the time when drop shadow is enabled.
The linked app in the article will help to see if the electron apps have been updated to fix the issue.
There is another performance problem in macOS Tahoe that is not introduced by Electron apps. The cursor become sluggish and a bit jumpy in horizontal movement, but no problem in vertical movement. It happened in all displayed Macbook Airs (but not in Pro) from few iBox stores here.
MacOS Tahoe becoming extremely sluggish. … - Apple C...
MacOS Tahoe becoming extremely sluggish. … - Apple C...
Luckily the Macbook Air I purchased is still have Sequoia installed. I think I will not move to Tahoe until next year. 
