# Performance difference in Asp.Net with IronRuby **URL:** \ **Category:** IronRuby\ **Created:** [June 2, 2008, 9:39am UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250 "2008-06-02T09:39:06Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 9:39am UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/1 "2008-06-02T09:39:06Z")
Hi, Will there be any significant difference between [Asp.Net](http://Asp.Net) with C# and IronRuby.? Since i have ready many blogs claiming C# to be running faster than [Vb.Net](http://Vb.Net), i just wanted to reconfirm that will IronRuby at par with C# or [Vb.Net](http://Vb.Net). I am more confused about performance since C# runs directly on CLR and… IronRuby runs on DLR, which itself runs above CLR. Let me make more clear. ## C# Runs on DLR ---------Only one layer. ## IronRuby ## DLR CLR --------------Two layers. Sorry for my newbie question. This question applies to IronRuby final RTM Thanks ---
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 10:21am UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/2 "2008-06-02T10:21:40Z")
On Mon, Jun 2, 2008 at 12:39 AM, Rahil K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Will there be any significant difference between [Asp.Net](http://Asp.Net) with C# and > IronRuby.? > > Since i have ready many blogs claiming C# to be running faster than > [Vb.Net](http://Vb.Net), i just wanted to reconfirm that will IronRuby at par with C# or > [Vb.Net](http://Vb.Net). This question pre-supposes that the speed of the language is the most important factor in the performance of a web-site, an assertion I believe to be contrary to most evidence and experience. ---
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 7:25pm UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/3 "2008-06-02T19:25:38Z")
It was true, early in .NET, that the C# compiler was a more aggressive optimizer than the [VB.net](http://VB.net) compiler. Not sure if it’s still true or not. ---
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 7:32pm UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/4 "2008-06-02T19:32:42Z")
Ah. Didn’t know that. Thanks! JD From: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] On Behalf Of Brad W. Sent: Monday, June 02, 2008 10:25 AM To: removed\_email\_address@domain.invalid Subject: Re: [Ironruby-core] Performance difference in [Asp.Net](http://Asp.Net) with IronRuby. It was true, early in .NET, that the C# compiler was a more aggressive optimizer than the [VB.net](http://VB.net) compiler. Not sure if it’s still true or not. On Mon, Jun 2, 2008 at 10:10 AM, Jim D. \ wrote: Sidenote: Can anyone give some links on those blogs (VB vs C#) they are both compiled to IL, so I don’t see why one would be faster, just curious. ---
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 8:22pm UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/5 "2008-06-02T20:22:47Z")
I’ve seen a couple suggestions on blogs that suggested C# was faster than [VB.NET](http://VB.NET), but when it came down to testing, either the code wasn’t directly equivalent or the performance difference was fairly negligible. If someone has something to suggest otherwise, I’d be interested in that too. ---
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 7:12pm UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/6 "2008-06-02T19:12:07Z")
Agreed, unless you are running high performance computing applications, like number crunching, your code will probably be slowed down by I/O, Database or other external factors. As far as performance, it isn’t a major concern for us yet. We are more focused on being compatible with RubySpec and CRuby. We will be involved in the Ruby Benchmark Suite project ([Let's create a Ruby Benchmark Suite | Programming Zen](http://antoniocangiano.com/2008/06/01/help-me-create-the-ruby-benchmark-suite/)), and will focus on those benchmarks when the time comes. I’d say a better comparison would be “will we be at par with JRuby or CRuby” and we hope to be on par with JRuby eventually. Sidenote: Can anyone give some links on those blogs (VB vs C#) they are both compiled to IL, so I don’t see why one would be faster, just curious. JD From: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] On Behalf Of Brad W. Sent: Monday, June 02, 2008 1:20 AM To: removed\_email\_address@domain.invalid Subject: Re: [Ironruby-core] Performance difference in [Asp.Net](http://Asp.Net) with IronRuby. On Mon, Jun 2, 2008 at 12:39 AM, Rahil K. \ wrote: Will there be any significant difference between [Asp.Net](http://Asp.Net) with C# and IronRuby.? Since i have ready many blogs claiming C# to be running faster than [Vb.Net](http://Vb.Net), i just wanted to reconfirm that will IronRuby at par with C# or [Vb.Net](http://Vb.Net). This question pre-supposes that the speed of the language is the most important factor in the performance of a web-site, an assertion I believe to be contrary to most evidence and experience. ---
**Author:** ![rahil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@rahil](https://www.ruby-forum.com/u/rahil)\ **Post date:** [June 2, 2008, 10:45pm UTC](https://www.ruby-forum.com/t/performance-difference-in-asp-net-with-ironruby/139250/7 "2008-06-02T22:45:33Z")
Rahil K.: > Will there be any significant difference between [Asp.Net](http://Asp.Net) with C# and > IronRuby.? > > Since i have ready many blogs claiming C# to be running faster than > [Vb.Net](http://Vb.Net), i just wanted to reconfirm that will IronRuby at par with C# or > [Vb.Net](http://Vb.Net). For pure computational speed, VB and C# are equivalent to each other and will be much faster than IronRuby. Whether you see the performance difference in real code will depend on where the bottleneck in your application is. For web application, it is highly unlikely that your app’s perceived performance will bottleneck in the code that renders HTML. It is far more likely the case that you’ll bottleneck on your database or some other shared resource. Thanks, -John