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GPUImage2 has been taking a lot of time to compile so I added the
-Xfrontend -debug-time-function-bodiestoOTHER_SWIFT_FLAGSand discovered the problem.The Swift compiler seems to be having issues with Lazy vars and Type inference, as such I fixed both and managed to save a lot of time as can be seen in the screenshots below:
Before fix:
After fix:
I'm sure a lot more stuff can be improved but this case was the most time demanding one.
For reference: Regarding Swift build time optimizations