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Damn, if IntelliJ is getting slower than Eclipse that's a big red flag. I don't use IntelliJ nowadays but 10 years ago IntelliJ was a vastly better and faster product. Wth is happening in Jetbrain?

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IntelliJ IDEA 2023.2 is super slow and barely usable on iMac, previous version to this was much faster!

No change / add in plugin's everything same.

After some troubleshooting, turns it the JVM i.e '17.0.7-b1000.6 Jetbrains Runtime with JCEF' that ships with IntelliJ IDEA 2023.2 is the problem.

Switched to using '17.0.8 Eclipse Temurin Java Runtime' and it's fast as before this release.

Hope this helps someone.

10 years is a long time and Eclipse then and now are two very, very different things. Eclipse is amazingly fast for what it does, I think.

Only started using IntelliJ about 3-4 years back (due to Android development) so I don't have any comparison from older days there.

Android Studio is pretty slow for a Jetbrains(-based) IDE. I think it really depends on the plugins. Rider (C#) is amazingly fast on my machine, but Webstorm (TS) is slow and less "intelligent". When I used Android Studio, its bad performance was mainly due to Gradle in my experience.

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