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

Question

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 l

Answer 1

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.

Answer 2

Using the C#, NUnit, C# webdriver client and IEDriverServer, I originally had the problem with slow input (e.g., sending keys to an input box would take about 5 seconds between keys, or clicking on a button same kind of delay).

Then, after reading this thread, I switched to the 32-bit IEDriverServer, and that seemed to solve the problem.

But today I was experimenting with the InternetExplorerOptions object in order to set some options on IE according to this documentation:

https://code.google.com/p/selenium/wiki/InternetExplorerDriver

Per the documentation, I created the registry value HKCU\Software\Microsoft\Internet Explorer\Main\TabProcGrowth with a value of 0 in order to use ForceCreateProcessApi = true and BrowserCommandLineArguments = "-private."

After doing this, I noticed that the slow-input problem was back. I had made several changes to my code, but after rolling all of them back, the problem still persisted. When I removed the aforementioned registry key, however, the input was back to full speed (no delay).

Answer 3

check 'prefer 32 bit' is not checked in your build properties. If it is and you are using the 64 bit IE driver it will run like an asthmatic snail.