IntelliJ often shows latency, but it's not "slow", it's doing a stupendous amount of work behind the scenes and building an incredibly rich model of your code and your application.
If you're not getting more out of IntelliJ than vim, then sure, vim will make you happier. But also then you're not getting from IntelliJ what it's trying to provide.
If you're not getting more out of IntelliJ than vim, then sure, vim will make you happier. But also then you're not getting from IntelliJ what it's trying to provide.