---
layout: releasenotes
title: New in Mono 3.0.3
version: 3.0.3
releasedate: '2013-01-08'
---

Mono garbage collectors now feature multiple dtrace probes for users on MacOS and Solaris.

Many stability improvements and performance work on Mono's Async support.

Garbage Collector
-----------------

Sgen now has a concurrent GC that can significantly reduce max pauses. This is an experimental feature that is been continuously developed. Click [here](http://schani.wordpress.com/2012/12/21/sgen-concurrent-mark) for more details.

Bug Fixes
---------

[#8401](https://bugzilla.xamarin.com/show_bug.cgi?id=8401), [#9247](https://bugzilla.xamarin.com/show_bug.cgi?id=9247), [#8903](https://bugzilla.xamarin.com/show_bug.cgi?id=8903), [#9087](https://bugzilla.xamarin.com/show_bug.cgi?id=9087), [#9225](https://bugzilla.xamarin.com/show_bug.cgi?id=9225), [#9186](https://bugzilla.xamarin.com/show_bug.cgi?id=9186), [#9118](https://bugzilla.xamarin.com/show_bug.cgi?id=9118), [#9137](https://bugzilla.xamarin.com/show_bug.cgi?id=9137), [#9133](https://bugzilla.xamarin.com/show_bug.cgi?id=9133), [#9116](https://bugzilla.xamarin.com/show_bug.cgi?id=9116), [#1446](https://bugzilla.xamarin.com/show_bug.cgi?id=1446), [#2246](https://bugzilla.xamarin.com/show_bug.cgi?id=2246), [#6918](https://bugzilla.xamarin.com/show_bug.cgi?id=6918), [#8904](https://bugzilla.xamarin.com/show_bug.cgi?id=8904), [#8927](https://bugzilla.xamarin.com/show_bug.cgi?id=8927), [#2907](https://bugzilla.xamarin.com/show_bug.cgi?id=2907), [#8829](https://bugzilla.xamarin.com/show_bug.cgi?id=8829), [#8786](https://bugzilla.xamarin.com/show_bug.cgi?id=8786)