I am optimizing the Xcode build speed. From the Travis build log, I have seen that Xcode precompiles the same pch file 4 times.
✓ Precompile Pods-CKCountdownButton-CKCountdownButton-prefix.pch (1946 ms)
✓ Precompile Pods-CKCountdownButton-CKCountdownButton-prefix.pch (1935 ms)
✓ Precompile Pods-CKCountdownButton-CKCountdownButton-prefix.pch (1338 ms)
✓ Precompile Pods-CKCountdownButton-CKCountdownButton-prefix.pch (1307 ms)
The full build log can be found https://travis-ci.org/cybertk/CKCountdownButton/builds/31503539
How can I reduce the building time by precompiling pch file only 1 time?