Oof. I work on an angular app and the build is slow as molasses because it's big. And we of course don't want to move away from the official build tool because build time improvements are always "right around the corner".
[1] https://nx.dev/latest/angular/core-concepts/computation-cach...
But the recent versions (and updating is also a breeze - mostly) should be faster. And particularly if you drop support for ES5 browsers.