It is slower. It's a fully fledged IDE, VSCode is not so it will always be way faster, but that's again this meme, JetBrains IDE's are super powerful so I guess you can say what it lacks in speed it got in power. It's also written in Java so it's memory heavy, but it is what it is.

I use both and I enjoy both. I would never however use JetBrains to open and edit a single file, its way to slow for that.