diff --git a/gradle.properties b/gradle.properties
index 87f95f2..7a6f3a1 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -10,8 +10,14 @@ kotlin.code.style=official
 # Enables namespacing of each library's R class, less RAM, faster builds.
 android.nonTransitiveRClass=true
 
-# Use new K2 compiler defaults (Kotlin 2.x).
+# Kotlin incremental compilation (default; kept explicit for documentation).
 kotlin.incremental=true
 
 # Reproducible builds for F-Droid.
 android.uniquePackageNames=true
+
+# Performance: enable parallel project execution and build cache (stable in Gradle 9).
+org.gradle.parallel=true
+org.gradle.caching=true
+# Configuration cache: compatible with AGP 9.1; opt in when all plugins confirm support.
+# org.gradle.configuration-cache=true
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 5dd3c01..b21b69e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.1-bin.zip
+distributionSha256Sum=bafc141b619ad6350fd975fc903156dd5c151998cc8b058e8c1044ab5f7b031f
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME