Hello, just ran a quick benchmark on a Android Project, Kotlin 1.4.30, and it seems `useIR` does slo...

# jvm-ir-backend-feedback

[Steffen Funke]

Hello, just ran a quick benchmark on a Android Project, Kotlin 1.4.30, and it seems useIR does slow down the build a bit:

useIR: false, clean & rebuild:
1. 41s
2. 41s
3. 40s

useIR: true, clean & rebuild:
1. 44s
2. 43s
3. 43s

Granted, it is only marginal slower since it is also only a relatively small project (single module) - but will it affect larger projects proportionally?

Out of curiosity I also tried with compose: true and was rather disappointed:

useIR: true, compose: true, clean & rebuild:
1. 53s
2. 52s
3. 52s

I honestly expected the new Backend to be if anything, then faster than the existing one?

[louiscad]

I'd expect compilation to be slower as you add compiler plugins, since there's more stuff to check and more code to run.

JVM IR is about sharing more compiler code with other Kotlin targets, to simplify changes, optimizations, and compiler plugins.