Add link to maven performance comparison

subprojects/docs/src/docs/release/notes.md

@@ -2,7 +2,7 @@ The Gradle team is pleased to announce Gradle 4.0.
 
 We are excited to share some great new features and improvements with you in this release:
 
-First and foremost, Gradle's [Build Cache](https://blog.gradle.org/introducing-gradle-build-cache) is now **production-ready for Java and Groovy** compilation and Java test tasks! This is further improved by overlapping outputs detection, configurable classpath normalization that avoids unnecessary task execution, and more listed in the [full release notes](#build-cache-improvements). The cacheability of other tasks, including other languages, will be completed in future releases.
+First and foremost, Gradle's [Build Cache](https://blog.gradle.org/introducing-gradle-build-cache) is now **production-ready for Java and Groovy** compilation and Java test tasks! This provides remarkable performance, making Gradle builds [up to 100x faster than Maven](https://gradle.org/gradle-vs-maven-performance) in common scenarios. This is further improved by overlapping outputs detection, configurable classpath normalization that avoids unnecessary task execution, and more listed in the [full release notes](#build-cache-improvements). The cacheability of other tasks, including other languages, will be completed in future releases.
 We invite you to check out our new guide for [maximizing effectiveness of the Gradle Build Cache](https://guides.gradle.org/using-build-cache/).
 
 Now on to user experience: this release has a number of enhancements in logging and terminal display. Log output is now **grouped by project and task** when attached to a terminal — output from tasks run in parallel will no longer be interleaved. However, logging behaves the same as previous Gradle versions in non-interactive environments, and with `--console=plain`, to allow automated tools like CI systems to parse the logs they expect.