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If it's in Java it's not exactly lightweight.

VSCode is Electron. You can't be more heavyweight.

You never started any Java-based IDE, did you? You can smack tons of plugins into VSCode, enable them all and it still loads faster.

Not using any of the above mentioned anymore, so I'm not teaming for one site.

Even with all those plugins it does a fraction of what IntelliJ provides, so it is apples to oranges.

Java itself doesn’t have that slow of a startup.

Java gui libraries are slow to start. Java starts fast but then GUI starts to load and it takes time.