diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 5673d01..90da087 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstream',
-  version: '3.0.28',
+  version: '3.0.29',
   description: 'simplifies access to node streams'
 }
diff --git a/ts/smartstream.classes.smartduplex.ts b/ts/smartstream.classes.smartduplex.ts
index 2d5b02a..ef7d68d 100644
--- a/ts/smartstream.classes.smartduplex.ts
+++ b/ts/smartstream.classes.smartduplex.ts
@@ -46,10 +46,10 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
 
   constructor(optionsArg?: ISmartDuplexOptions<TInput, TOutput>) {
     super(Object.assign({
-      highWaterMark: 1,
+      highWaterMark: 4,
     }, optionsArg));
     this.options = optionsArg;
-    this.backpressuredArray = new plugins.lik.BackpressuredArray<TOutput>(this.options.highWaterMark || 1)
+    this.backpressuredArray = new plugins.lik.BackpressuredArray<TOutput>(this.options.highWaterMark || 4)
   }
 
   public async _read(size: number): Promise<void> {