Disable/Change IntelliJ IDE splash screen

It can be disabled by running with nosplash command line option. For example, idea.exe nosplash (on Windows).

You can modify the menu/desktop shortcut to run with this parameter automatically. There is also a feature request to make it a setting, feel free to vote.

In case you want to change the image, it's loaded from this file: <IDEA_DIR>\lib\resources.jar\idea_logo.png.