diff --git a/lynglib/src/androidMain/kotlin/net/sergeych/lyng/PerfDefaults.android.kt b/lynglib/src/androidMain/kotlin/net/sergeych/lyng/PerfDefaults.android.kt
index 16c0570..2d31712 100644
--- a/lynglib/src/androidMain/kotlin/net/sergeych/lyng/PerfDefaults.android.kt
+++ b/lynglib/src/androidMain/kotlin/net/sergeych/lyng/PerfDefaults.android.kt
@@ -15,4 +15,6 @@ actual object PerfDefaults {
 
     actual val PRIMITIVE_FASTOPS: Boolean = true
     actual val RVAL_FASTPATH: Boolean = true
+    // Regex caching aligns with JVM behavior on Android (Dalvik/ART)
+    actual val REGEX_CACHE: Boolean = true
 }
\ No newline at end of file
diff --git a/lynglib/src/jsMain/kotlin/net/sergeych/lyng/PerfDefaults.js.kt b/lynglib/src/jsMain/kotlin/net/sergeych/lyng/PerfDefaults.js.kt
index 3da9b18..29c7ca1 100644
--- a/lynglib/src/jsMain/kotlin/net/sergeych/lyng/PerfDefaults.js.kt
+++ b/lynglib/src/jsMain/kotlin/net/sergeych/lyng/PerfDefaults.js.kt
@@ -16,4 +16,6 @@ actual object PerfDefaults {
     actual val PRIMITIVE_FASTOPS: Boolean = true
     // Conservative default for non-JVM until validated
     actual val RVAL_FASTPATH: Boolean = false
+    // Regex caching: disabled by default on JS until validated
+    actual val REGEX_CACHE: Boolean = false
 }
\ No newline at end of file
diff --git a/lynglib/src/nativeMain/kotlin/net/sergeych/lyng/PerfDefaults.native.kt b/lynglib/src/nativeMain/kotlin/net/sergeych/lyng/PerfDefaults.native.kt
index 3da9b18..2169c5c 100644
--- a/lynglib/src/nativeMain/kotlin/net/sergeych/lyng/PerfDefaults.native.kt
+++ b/lynglib/src/nativeMain/kotlin/net/sergeych/lyng/PerfDefaults.native.kt
@@ -16,4 +16,6 @@ actual object PerfDefaults {
     actual val PRIMITIVE_FASTOPS: Boolean = true
     // Conservative default for non-JVM until validated
     actual val RVAL_FASTPATH: Boolean = false
+    // Regex caching: keep OFF by default on Native until benchmarks validate it
+    actual val REGEX_CACHE: Boolean = false
 }
\ No newline at end of file
diff --git a/lynglib/src/wasmJsMain/kotlin/net/sergeych/lyng/PerfDefaults.wasmJs.kt b/lynglib/src/wasmJsMain/kotlin/net/sergeych/lyng/PerfDefaults.wasmJs.kt
index 3da9b18..6e528b6 100644
--- a/lynglib/src/wasmJsMain/kotlin/net/sergeych/lyng/PerfDefaults.wasmJs.kt
+++ b/lynglib/src/wasmJsMain/kotlin/net/sergeych/lyng/PerfDefaults.wasmJs.kt
@@ -16,4 +16,6 @@ actual object PerfDefaults {
     actual val PRIMITIVE_FASTOPS: Boolean = true
     // Conservative default for non-JVM until validated
     actual val RVAL_FASTPATH: Boolean = false
+    // Regex caching: disabled by default on WasmJS until validated
+    actual val REGEX_CACHE: Boolean = false
 }
\ No newline at end of file