Why is IntelliJ 13 IDEA so slow after upgrading from version 12?

Question

While using IntelliJ 13 ultimate edition for a week, it just seems really slow.

First of all, the whole IDE stops for a second or so every once in a while. The Java

Answer 1

IntelliJ version 13 is markedly slower than the 12 version from my experience. There are a few ways to speed it up, like increasing the VM options for intelliJ. For eg. I'm using a maven project, and for that I increased the runner and importer options to 4GB . It made things much faster than before.

Answer 2

I was facing sluggish performance with Intellij 2016.1(64-bit) and JDK 1.8(64-bit). I switched to

• 64 bit intellij
• 64 bit Java 8 as JAVA_HOME path (This is required to run 64-bit Intellij)
• 32 bit Java 8 as JDK to be used for Intellij projects (File -> Project Structure | Project Settings -> Project | Project SDK).

By this combination, now Intellij performance is quite OK.