[swift-users] Very slow compilation of `lazyvar` properties

Zachary Waldowski zach at waldowski.me
Fri Apr 29 13:29:53 CDT 2016

Tadeas Kriz via swift-users <swift-users <at> swift.org> writes:

> Hey everyone!
> I spent last few days trying to bring down compilation time of our iOS
> project, which has about 500 files and 50k lines (plus ~20 dependencies
> precompiled into frameworks by Carthage).
> I stumbled upon this http://irace.me/swift-profiling and wrote myself a simple
> script that sums up all the times spent on various places in code. To my
> surprise, I found out that many of the lines that took the most of time to
> compile were simply `lazy var ` properties in classes. Is it unique to our
> project (I mean caused by misconfiguration) or do you guys see this as well?
> Thanks!
> Tadeas
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> swift-users <at> swift.org
> https://lists.swift.org/mailman/listinfo/swift-users

I’ve identified this as well. It’s pretty severe in my current project, which is
of a similar size. Various sprinklings of “private”, “final”, and “@nonobjc”
all seem to have no positive effect. Using the self-calling closure version
seems to exacerbate the problem.


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