Depends on the size I'd say but in theory yes. Lots of things factor into 
the compilation times, even tiny namespaces can take a long time to compile 
if some macro just takes a long time to do its thing.

On Friday, January 17, 2020 at 11:18:21 AM UTC+1, Khalid Jebbari wrote:
>
> Thanks for the detailed answer. Does it somewhat mean that splitting code 
> into smaller namespaces can achieve faster compilation thanks to 
> parallelization ?
>
>
> On Fri, Jan 17, 2020 at 10:43 AM Thomas Heller <th.h...@gmail.com 
> <javascript:>> wrote:
>
>> It depends on the namespaces used. In general a CLJS namespaces can only 
>> be compiled once all its dependencies have been compiled. So if those 
>> dependendencies can be compiled in parallel they will use multiple threads 
>> from a pool, which should keep all cores busy. In my experience a good 
>> balance between core count and core speed matters. If you have big 
>> namespaces that a lot of other namespaces depend on (eg. like cljs.core) 
>> then its compilation will "block" all other threads so its important it 
>> finishes fast (ie. fast cores). If you have lots a small namespaces that 
>> are mostly independent then you can get maximum parallelization (ie. many 
>> cores). 
>>
>> I have a i7-8700K 6c and there are builds that aren't able to use all 
>> cores due to the namespace setup (few very large ones). Others happily use 
>> everything. Single core difference is gigantic to my previous CPU from a 
>> macbook pro 2016.
>>
>> If you really really want to torture your CPU you can try 
>> https://github.com/mfikes/fifth-postulate or 
>> https://github.com/mfikes/coal-mine to compare.
>>
>> HTH,
>> Thomas
>>
>> On Friday, January 17, 2020 at 5:29:06 AM UTC+1, Khalid Jebbari wrote:
>>>
>>> Hello,
>>>
>>> We're using the parallel build option, and I noticed the difference in 
>>> speed between my laptop and other laptops is basically proportional to the 
>>> difference in speed of the CPUs (based on notebookcheck's benchmarks). I 
>>> have 4C/8T 7700HQ CPU and my colleagues have a 8565U iirc (some have the 
>>> 6600U). Mine is almost twice as fast in benchmarks, which is reflected in 
>>> cljs compilation times.
>>>
>>> So my question is how does the cljs compiler scale with regards to CPU? 
>>> Core count? Single thread perf? All cores frequencies? Is it capped to some 
>>> number of cores?
>>>
>>> -- 
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