I've been a JetBrains user for about a decade now (intelliJ/RubyMine/PHPStorm) and for general editing you really don't notice the performance issues at first. But if you leave it running long enough or you make use of features that lean heavily on indexing like code inspections on large codebases or language level inspections as a couple of examples it will chew through memory like crazy and drag a machine down that's newer and higher spec'ed than you've listed.

That said, given everything it provides I don't think there is a better tool for the job despite the performance issues.