The last project I used Eclipse on consisted of like 50 different maven modules. Plus we were also using a mix of Java and Scala code. The Scala plugin we were using seemed to make everything run very, very slowly. At times, it couldn't even keep up with my typing.
This was back in 2011 though. Obviously things have changed.
The difference between Eclipse and IntelliJ was like night-and-day, however, in terms of performance.
I used Eclipse a long time ago and it had horrible performance. But IntelliJ quality had been really bad in recent years. Minor updates causing major performance regression, taking massive CPU when nothing is being worked on. It was way more stable product in earlier versions.
I work on an enterprise project with 100+ gradle projects and a pile of targets for docker containers, kubernetes deployments, DB schemas, Redis stuff, etc..
Eclipse is incredibly slow in this use case compared to IntelliJ and would frequently gobble 10GB of Ram. I switched from Eclipse to IntelliJ earlier this year after years on this project and IntelliJ is amazingly better.
But if you're using some different build system and a different type of project configuration maybe it's the other way around..
I think the thing with these