Add link for performance optimization

Author: holly-cummins

docs/src/main/asciidoc/extension-maturity-matrix.adoc

@@ -132,7 +132,7 @@ To get your library working properly with virtual threads, you should make sure
 
 === Hot path performance optimization
 
-Although Quarkus offers some unique opportunities for extension performance, extension developers shouldn't forget the basics of performance optimization.
+Although Quarkus offers some unique opportunities for extension performance, extension developers shouldn't forget https://www.linkedin.com/pulse/how-optimize-software-performance-efficiency-subcodevs/[the basics of performance optimization].
 
 === Non-blocking internals