# High Sierra - Terminal lags if background opacity is set - Ask Different

<https://apple.stackexchange.com/questions/299982/high-sierra-terminal-lags-if-background-opacity-is-set>

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- Saved: October 13, 2017 (2017-10-13T12:06:24Z)
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## What Jamie wrote

This bug in High Sierra is really bad for terminal. I have a MacBook Pro (Retina, Mid 2012) and with opacity set to 90% on terminal windows they are unusably slow. If I don't use transparency it works fine. Oddly enough when the window is in the background it seems to go faster. 😞

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## Appears in

- [WT23: Weekly Thing for October 14, 2017](https://weekly.thingelstad.com/archive/23/), Links 📌

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