Silencio

Shut up, Xcode.

SourceKitService crashes slow down Xcode. As it turns out, this is because of the bezel it displays at that time. Inhibit that, speed up Xcode.

IMPORTANT: This is only guaranteed to be helpful in Xcode 6.0, 6.1, and 6.2. In 6.3 rumor has it that this behavior is improved.

Terminology

SourceKit/SourceKitService: The framework and XPC service (respectively) responsible for Swift.
IDEKit: UI framework for Xcode's implementation
IDEFoundation: Business logic for Xcode's implementation
IDESourceEditor: Plugin containing base text view for Xcode
IDELanguageSupportUI: Plugin containing support for "third-party" languages (i.e., Swift)
IDESourceCodeDocument: Base NSDocument subclass for source code
- IDEPlaygroundDocument: Subclass for playgrounds.
sourceLanguageServiceAvailabilityNotification:message:: Delegate callback (unknown protocol) for Swift crasher bezel

Silencio is available with no warranty for use or misuse. See LICENSE for more details.

Move use of JRSwizzle into something more suited (imp_implementationWithBlock)
(Efficiently!) add an indicator to IDEActivityView when SourceKit crashes