Why is Selenium InternetExplorerDriver Webdriver very slow in debug mode (visual studio 2010 and IE9)

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I’m using the example code from the SeleniumHq site – but in debug mode the performance is awful.

In release mode the entire test takes about 6 seconds (including launching and closing IE)
In Debug mode it takes 65 seconds ?

The sample code is just :

    [Test]
public void testBrowser()
{
// Do something here
IWebDriver driver = new InternetExplorerDriver();
//Notice navigation is slightly different than the Java version
//This is because 'get' is a keyword in C#
driver
.Navigate().GoToUrl("http://www.google.com");
IWebElement query = driver.FindElement(By.Name("q"));
query
.SendKeys("Cheese");
System.Console.WriteLine("Page title is: " + driver.Title);
// TODO add wait
driver
.Quit();
}

I’ve tried it in ie8 and have the same performance. Firefox is fine – but my clients use IE so I’m stuck with testing against it. Also – I don’t have the same issues if I use Selenium RC.

NB – I’m using .Net 4 and the latest version (2.16) of the webDriver.dll (running on a 64bit windows 7 box)

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For me, the fix was to switch to the 32 bit version of InternetExplorerDriver.exe from https://code.google.com/p/selenium/downloads/list

Seemingly named IEDriverServer nowadays, but works if you just rename it to InternetExplorerDriver.exe.

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