Roboelectric slow and gives warnings

This is my first time using Roboelectric. Writing my first test which is just a simple test asserting the title of the Activity takes about 18s to execute and gives me the following warnings:

WARNING: no system properties value for "ro.control_privapp_permissions"
WARNING: no system properties value for "ro.crypto.state"
WARNING: no system properties value for "ro.crypto.type"

What are those warnings? and even if I ignore the warnings, should it really take 18s to execute this small test?

This is the test:

@Test
public void titleIsCorrect() throws Exception {
    Activity activity = Robolectric.setupActivity(MainActivity.class);
    assertTrue(activity.getTitle().toString().equals("Title"));
}