Not everyone is experiencing this issue, but some have found that disabling Slack indexing makes Spotlight responsive again.
Apple released iOS 10.3.2 Monday. The patch notes for the updates indicate it is entirely a maintenance update, noting that it “includes bug fixes and improves the security of your iPhone and iPad.”
There’s a report making the rounds claiming Apple is dropping support for the iPhone 5 and iPhone 5c in iOS 10.3.2, and they’re wrong. Apple hasn’t ever cut device support with a minor point update, and that holds true for iOS 10.3.2.