mention rust extension in performance page

python-manual/modules/ROOT/pages/performance.adoc

@@ -1,5 +1,13 @@
 = Performance recommendations
 
+[[rust-extension]]
+== Use the Rust extension
+
+The link:https://github.com/neo4j-drivers/neo4j-python-driver-rust-ext[Rust extension to the Python driver] is an alternative driver package that yields a link:https://neo4j.com/developer-blog/python-driver-10x-faster-with-rust/[3x to 10x speedup] compared to the regular driver.
+You can install it with `pip install neo4j-rust-ext`, either alongside the `neo4j` package or as a replacement to it.
+Usage-wise, the drivers are identical: everything in this guide applies to both packages.
+
+
 [[target-database]]
 == Always specify the target database