Ugh, IntelliJ editing performance is absolutely te...

# announcements

[Bob Glamm]

Ugh, IntelliJ editing performance is absolutely terrible with Kotlin. 3GB of RAM allocated to IJ and it slows to a crawl with lots of multi-second GC pauses between keystrokes. Are there any workarounds for this or any fixes planned?

[Zach Klippenstein (he/him) [MOD]]

I believe intellij 2019.x + kotlin has a bunch of performance regressions that aren't scheduled to be fixed until mid-2020. @Steff Nicolas has been doing a lot of profiling work and driving for this stuff to get fixed, but most of the devs in my org are still using 2018.3 to get around this for now. 😣

[Steff Nicolas]

There is an issue in IJ 2019.3 for Android projects. The Android manifest are scanned during completion. A fix will happen but first on AS 4.1 and we will have to wait for a backport to IJ 2020

[Bob Glamm]

My use case is non-Android, unfortunately

[Bob Glamm]

But it appears that power-save mode works well enough

[Bob Glamm]

for now

[Steff Nicolas]

I am not aware of any other pure kotlin inspection that slows down IJ completion for kotlin in IJ 2020+.
The best would be to profile the IDE and find what operation is running and taking too long.

[danny]

Help -> Diagnostic has CPU profiling, which saves you having to install a profiler. IntelliJ also automatically outputs dumps when it detects slowness

[danny]

I reported https://youtrack.jetbrains.com/issue/KT-28564 over a year ago and as far as I can tell it's still not fixed, so performance doesn't seem to be a priority

[danny]

Power-save mode turns off inspections IIRC so I don't think that's much of a solution

[Bob Glamm]

@Steff Nicolas I'll turn off all non-Java/Kotlin extensions & restart without power-save to see if that is it, but I don't run with many extensions, period

[Steff Nicolas]

Inspections you mean ?

[Bob Glamm]

Extensions. I have no custom Kotlin inspections running without power-save mode enabled.

[Bob Glamm]

.. although it might be the indexing that is a problem