Hi JetBrains developers,
Usually upgrades to IDEA new major version were seamless, but this is the first version when I had to downgrade to 2018.3.
New version has some noticeable pauses (up to 0.5 s. or occasionally up to 1 s.) when doing autocomplete or typing in Java editor, or actions like context menu on package and "Create new class". Also confirmed by my colleague who's using IDEA 2019.1 as well.
I always checked "Download JetBrains JRE" in both 2018.3 and 2019.1, just had to increase memory size to 1024Mb when IDEA crashed with default memory (I have large projects).
I hope you are aware and working on this.