The LCMS 2.8 release candidate 1 has code for handling alpha channels during ICC profile conversions:

"2.8 does support alpha channel transportation and a new transform stride function and plug-in which can be used to increase significantly the processing speed."


Perhaps this new code could be useful for helping GIMP make faster ICC profile conversions? As there are a lot of profile conversions going on with some of the new color management code, probably every little bit helps.

Here's the link to the announcement and discussion:

https://sourceforge.net/p/lcms/mailman/lcms-user/thread/000001d1c02a%249a1ac4a0%24ce504de0%24%40littlecms.com/#msg35140820
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