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Comment by namibj | Hacker News Reader

Easy fix: replace the the existing GC line with

  -XX:+UnlockExperimentalVMOptions
  -XX:+UseZGC

and enjoy no more visible lag spikes.

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If it was this easy, we'd have enabled this by default. Unfortunately by far not all UI freezes in IntelliJ IDEA are caused by GC, and ZGC is not a wholesale performance improvement even for those scenarios which do depend on GC.

[deleted]

> it seems like they don't care about the product itself and now it's all about marketing

This is absolute silly hogwash with nothing to back it up.

If you think the product hasn't gotten better, completely fair to share that. To blatantly claim you know the inner motivations of its workforce and they don't care about the product is not productive.

A lot of our work is open-source. You can easily see that our investment into improving our products, visible through the open-source repositories, has been steadily increasing every year.

I don't think you guys should feel like you need to respond to these sorts of comments. JetBrains products are so clearly genre defining and to have some of them for free is just a cherry on top.

Here's a list of various config changes to improve Intellij performance. These were just cobbled together and I have a feeling the JVM settings are out of date, so any updates or suggestions or links to better pages would be welcome. https://github.com/jordanmews/intellij_performance_settings

Not all, but with the default settings I had freezes, even if I had more than 300% over provisioning. The requirement is "no GC pauses that cause frame drops" (well, occasional single-frame drops aren't really noticeable, but anything worse starts to become visible).

A large issue is afaik the lack of memory reclamation and the over provisioning required to even really work at all.

Do you mean for recent, IntelliJ based IDEs? Interestingly, when I tried this with Pycharm Pro 2019.3.2 I got: ``` Error occurred during initialization of VM Option -XX:+UseZGC not supported ```

You need a newer JVM. It needs to be at least Java 11.

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