I switch between IntelliJ and Eclipse during my daily workflow and IntelliJ always feels like an absolute hog. And I do feel like it's been getting worse with the later releases.
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?
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.