Why is Selenium InternetExplorerDriver 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 very slow.

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 below:

    [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.

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

Aug 8, 2018 in Selenium by GandalfDwhite
• 1,320 points
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0 votes

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.

answered Aug 8, 2018 by Meci Matt
• 9,400 points

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