I'm trying out your product, and I believe the non-present assertion could use some customization/changing.
I'm using non-present assertions and they seem to take 30 seconds each, as explained in the docs. This delay makes sense for most assertions where you might be waiting for something to appear, but it makes the test way slower when you just want to check that some div is not displayed anymore.
Two small sanity-check assertions add 1 whole minute to the test.
Reducing the default behavior for this specific assertion or letting the user set a custom time limit would be great. If I missed something I apologize in advance.