Skip to main content

Comparing performance of .Net 4.5 to .Net 4.0 for WPF

Currently I'm working on a .Net 4.0 WPF app and we've had some discussion about moving to .Net 4.5, we don't get to make the decision :( but we're interested to know what performance gain we'd get.

What follows is a comparison of the same app compiled against .Net 4.0 & 4.5. The app makes use of a couple of NuGet packages - Autofac & Reactive Extensions, both of which provide versions for both .Net 4.0 & 4.5. It also makes use of Telerik grid control to render the data.

What does the app do?

Pretty simple, it generates a 1000 rows of data asynchronously and binds this to a telerik grid, for every iteration the grid is clear of any data first.
How am I going to measure any performance improvement?

I'm using the code from a previous post - 'Measuring UI Freeze...', I'm expecting any improvement to be visible in a reduced amount of time on the dispatcher thread - if the (.Net) code base is more efficient it should surely reduce the amount of time required to render the UI.

I'm going to repeat the generation and rendering of data 100 times for each version of the framework, this should allow an statistical anomalies to be ignored.

How am I going to record any improvement?

Simply write out to file any value that exceeds 1000 milliseconds, this is done in the App_Startup method:
So what's the outcome?

The outcome is best visualised as a set of graphs, first a scatter graph where x-axis represents the iteration and y-axis represents the UI freeze duration in milliseconds:
and more impressively a bell curve,where the x-axis represents the duration in milliseconds of any UI freeze and frequency on the y-axis:
Averages are as follows:

.Net 4.0 average = 1605 ms
.Net 4.5 average = 1337 ms (elite :))

Or to put it another way this is a 16% increase in performance!

Okay so this wasn't anywhere near a scientific approach but it did show over 100 iterations there is measurable improvement, I've made the code available for the .Net 4.5 version.

Comments

  1. Dear Ollie,
    Thank for your post. I have to make a similar decision, so it should help me.

    Cheers!
    --
    Rajiv Verma

    ReplyDelete

Post a Comment

Popular posts from this blog

WPF tips & tricks: Dispatcher thread performance

Not blogged for an age, and I received an email last week which provoked me back to life. It was a job spec for a WPF contract where they want help sorting out the performance of their app especially around grids and tabular data. I thought I'd shared some tips & tricks I've picked up along the way, these aren't probably going to solve any issues you might be having directly, but they might point you in the right direction when trying to find and resolve performance issues with a WPF app. First off, performance is something you shouldn't try and improve without evidence, and this means having evidence proving you've improved the performance - before & after metrics for example. Without this you're basically pissing into the wind, which can be fun from a developer point of view but bad for a project :) So, what do I mean by ' Dispatcher thread performance '? The 'dispatcher thread' or the 'UI thread' is probably the most

Showing a message box from a ViewModel in MVVM

I was doing a code review with a client last week for a WPF app using MVVM and they asked ' How can I show a message from the ViewModel? '. What follows is how I would (and have) solved the problem in the past. When I hear the words ' show a message... ' I instantly think you mean show a transient modal message box that requires the user input before continuing ' with something else ' - once the user has interacted with the message box it will disappear. The following solution only applies to this scenario. The first solution is the easiest but is very wrong from a separation perspective. It violates the ideas behind the Model-View-Controller pattern because it places View concerns inside the ViewModel - the ViewModel now knows about the type of the View and specifically it knows how to show a message box window: The second approach addresses this concern by introducing the idea of messaging\events between the ViewModel and the View. In the example below

Implementing a busy indicator using a visual overlay in MVVM

This is a technique we use at work to lock the UI whilst some long running process is happening - preventing the user clicking on stuff whilst it's retrieving or rendering data. Now we could have done this by launching a child dialog window but that feels rather out of date and clumsy, we wanted a more modern pattern similar to the way <div> overlays are done on the web. Imagine we have the following simple WPF app and when 'Click' is pressed a busy waiting overlay is shown for the duration entered into the text box. What I'm interested in here is not the actual UI element of the busy indicator but how I go about getting this to show & hide from when using MVVM. The actual UI elements are the standard Busy Indicator coming from the WPF Toolkit : The XAML behind this window is very simple, the important part is the ViewHost. As you can see the ViewHost uses a ContentPresenter element which is bound to the view model, IMainViewModel, it contains 3 child v