I intend to release my app to the App Store soon (after TestFlight). I have quite a few view controllers with print statements in them. The print statements are for testing purposes (debugger) and the user will never see them.
Will it make any difference if I do or don't include the print statements inside the app once I release it?
Will the print statements make any difference as far as reducing speed when switching between scenes even if by milliseconds?
Can I get rejected for including them inside my app?
In couple of vcs I print the uids just for clarity on my part. Are there any security risks by including those print statements in the app?
I assume you are using Swift, then print is completely safe, even for AppStore builds. You are not going to be rejected and it's not a security risk either.
print, unlike similar NSLog, is not going to produce any logs anywhere that would be visible to the user (e.g. in Xcode Device Console).
More info on the difference between print and NSLog: Swift: print() vs println() vs NSLog()