But it doesn't run off and do I/O ... that's the bug! The OP assumed that setting the variable causes the new page to be loaded but it doesn't--it just says wha

But it doesn't run off and do I/O ... that's the bug! The OP assumed that setting the variable causes the new page to be loaded but it doesn't--it just says what page should be loaded. The page doesn't get loaded until the app goes idle. So this whole discussion about setters and side effects is completely off kilter.