Reporting build-times changes, in a ~15loc CLJ/CLJS/CLC project, on a 
8-cores CPU machine, with :parallel-build always true and timings as 
reported by :compiler-stats true, using boot-cljs. I've run each build at 
least twice to check for variations.

With CLJS 1.10.339
- :optimizations :none 
Compile sources, elapsed time: 11628.251228 msecs
Compile sources, elapsed time: 1865.551867 msecs
=> Total: ~13.5 secs (13493.803095 msecs)
- :optimizations :advanced
Compile sources, elapsed time: 13882.684487 msecs
Compile sources, elapsed time: 22.481435 msecs
Optimizing with Google Closure Compiler, elapsed time: 15468.294224 msecs
Optimizing 265 sources, elapsed time: 15892.028818 msecs
=> Total: ~45 secs (45265.488964 msecs)

With CLJS 1.10.439
- :optimizations :none
Compile sources, elapsed time: 11551.295873 msecs
Compile sources, elapsed time: 1337.826701 msecs
=> Total: ~12.8 secs (12889.122573999999 msecs)
- :optimizations :advanced
Compile sources, elapsed time: 12874.073566 msecs
Compile sources, elapsed time: 23.319803 msecs
Optimizing with Google Closure Compiler, elapsed time: 16746.485323 msecs
Optimizing 265 sources, elapsed time: 17214.70572 msecs
=> Total: ~46.8 secs (46858.584412 msecs)

No significant changes in compilation times, but it may be due to 
boot/boot-cljs overhead, no idea. This is completely unscientific, as it 
may not make use of the some things enabled only when using cljs.main.

I've also received a warning for a :private-var-access in one of my 
dependencies, will open an issue there.

End of report. And big thanks to all contributors!

On Monday, November 5, 2018 at 7:34:18 PM UTC+1, David Nolen wrote:
>
> ClojureScript, the Clojure compiler that emits JavaScript source code.
>
> README and source code: https://github.com/clojure/clojurescript
>
> Leiningen dependency information:
>
> [org.clojure/clojurescript "1.10.439"]
>
> Please refer the announce post for the details:
> https://clojurescript.org/news/2018-11-02-release
>
> As always, feedback welcome!
>
> ## 1.10.439
>
> ### Changes
> * CLJS-2904: Default :npm-deps to false
> * CLJS-2878: Update Closure Compiler to v20180805
> * CLJS-2827: Avoid var special in core macros for private var access
> * CLJS-2819: Warn on non-dynamic earmuffed vars
> * CLJS-2806: Bump test.check to 0.10.0-alpha3
> * CLJS-2815: Support string keys in :global-exports
> * CLJS-2812: Support for overriding object printing
> * CLJS-2805: Bump tools.reader to 1.3.0
> * CLJS-1702: Warning when using private vars
> * Align ClojureScript AST to tools.analyzer
>
> ### Enhancements
> * CLJS-2903: Support fingerprinting
> * CLJS-2897: cljs.main: Display initial REPL prompt sooner
> * CLJS-2884: Support for GraalJS RC6
> * CLJS-2859: Graal.JS: Enable high-res timers by default, allow 
> user-configuration
> * CLJS-2831: Add a graaljs REPL environment
> * CLJS-1997: Outward function type hint propagation
> * CLJS-844: Optimize js->clj by switching to transients
> * CLJS-2442: `set` and `vec` performance enhancements
>
> ### Fixes
> * CLJS-2953: stest/with-instrument-disabled prints warning of private use
> * CLJS-2728: Ability to disable macro spec checks
> * CLJS-2843: s/explain of evaluated predicate yields :s/unknown
> * CLJS-2951: Add a spec generator for some?
> * CLJS-2940: Can't define nilable spec on undefined pred
> * CLJS-2948: Stack overflow calling instrumented variadic fn with zero args
> * CLJS-2793: Instrumenting breaks function with varargs
> * CLJS-2934: Enhanced delay printing
> * CLJS-2864: Optimize str macro for single arity case
> * CLJS-1297: defrecord does not emit IKVReduce protocol
> * CLJS-2937: docstring for to-array
> * CLJS-2943: Update merge-with to use key / val
> * CLJS-2941: seqable? should return true for nil
> * CLJS-2915: Tests fail if directory has a period (.) in the path
> * CLJS-2782: lein test fails if directory has hyphens
> * CLJS-2911: Avoid infinite loop on infinite partitions
> * CLJS-2906: cljs.main: Crash when with default REPL
> * CLJS-2883: Instrumentation fails compilation with a large number of 
> spec'd functions
> * CLJS-2896: Allow parallel analysis and compilation
> * CLJS-2893: seq: use .-length instead of alength for strings
> * CLJS-2890: fspec role in problem path is not useful
> * CLJS-2887: Improve names in core macro specs
> * CLJS-2891: stop including data in ex-info message
> * CLJS-2888: Printing of spec problems buries the failing predicate which 
> should be more prominent
> * CLJS-2861: Self-host: :checked-arrays not working
> * CLJS-2852: Clojure imparity: ns-publics returns different arglists for 
> macros
> * CLJS-2725: Doc on spec keywords
> * CLJS-2665: Port clojure.spec.test.alpha/enumerate-namespace
> * CLJS-2848: Default explain printer prints root val and spec
> * CLJS-2846: [spec] s/tuple explain-data :pred problem
> * CLJS-2847: s/coll-of and s/every gen is very slow if :kind specified 
> without :into
> * CLJS-2841: [spec] instrument exception doesn't contain function name in 
> ex-data
> * CLJS-2842: [spec] Clarify s/every docstring for :kind
> * CLJS-2845: [spec] generate random subsets of or'd required keys in map 
> specs
> * CLJS-2844: [spec] Add support for undefining a spec
> * CLJS-2840: [spec] s/keys explain-data :pred problem
> * CLJS-2839: [spec] s/& explain-data :pred problem
> * CLJS-2838: [spec] s/& does not check preds if regex matches empty 
> collection
> * CLJS-2837: [spec] `cat` specs should verify value is sequential
> * CLJS-2541: binding not made in parallel
> * CLJS-2832: Bad code gen for `((not empty?) "foo")` when compiled with no 
> optimizations
> * CLJS-2855: Browser REPL prints empty string after require
> * CLJS-2821: Update doto docstring to not use Java example
> * CLJS-2817: Suppress private var warnings for specs on private vars
> * CLJS-2822: cljs.core.specs.alpha: Map bindings should be `:kind map?`
> * CLJS-2829: Fix deep object property access for :global-exports
> * CLJS-2816: Skip non-string package.json browser entry values
> * CLJS-2814: Fix munge-node-lib/global-export on self-host
> * CLJS-2811: cljs-1537-circular-deps fail on Windows
> * CLJS-2807: Macroexpand failure with set literal
> * CLJS-2799: Handle nth on seqables with negative indexes
> * CLJS-2798: ChunkCons -next doesn't handle nil more
> * CLJS-2589: allow / as a protocol method name in cljs
>
>

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