But when configured properly, it actually has parallel builds, with fine-grained build dependencies, so only the actually changed classes will be recompiled.
Android is probably the only platform whose conferences to this day have a sessions about improving build times, thanks Gradle.
When doing Windows CE, Pocket PC, Windows Phone 7, WinRT, Symbian, iOS, I never needed a gaming rig as development workstation.
The problem is the amount of dependencies/build tasks, not the tool managing those.
Thankfully outside Android, I never have to put up with it on regular Java projects.
Yeah, it is very fast, when one has all the knobs to help Gradle pretend it is fast.
I have been setting up Java CI/CD pipelines since 2005, have used all major CI/CD products in the Java world, including your beloved "blazing fast" Gradle.