JetBrains to my understanding like a traditional IDE similar to Visual Studio (classic) that comes with a lot of stuff in the box that lighter weight text editor inspired development environments don’t have.

It is completely expected that it’s slower.

I remember my first job I had to request a new workstation just to tolerate using Visual Studio. (Actually, all I asked for was an SSD, but my manager over-delivered and went ahead with a whole new workstation)