After updating to Xcode 14.0 (happens still for 14.0.1, and 14.1) I felt massive slowdown in incremental build times even if changing just a single property. For my project it's 3x, but read about 10x or more.
To fix that, you simply need to add user defined build setting SWIFT_USE_INTEGRATED_DRIVER
and set it's value to NO
you can do so by going to project navigator -> select your target -> Build Settings -> Now you need to click on the plus in the section below and tap "Add User-Defined Setting"
Xcode should scroll to the field and focus on it automatically, but if not scroll to the bottom or search for your field in the filter on the right and set your value to "NO"
This topic is covered more broadly on swift forum and this is from where I got this fix
I believe this is a temporary solution, due to some swift driver issues, if I found it to be no longer needed. I'll update the answer. From my own observations, I can't see any parallel compilations tasks being run with the driver on. Only one big emit module for main app target.