Stellar journalism as ever...
What's with comparing Edge's HTML performance (in fact, the performance of a future version of Edge) to Firefox 48, which it conveniently beats? The current version of Firefox is 52, which scores 474, beating the current and future versions of Edge. An inconvenient truth?
And as has been pointed out elsewhere, you change the size of the calculator app like any other window since god knows when. The new size will persist. Only a moron would be complaining about this "bug" this long after the OS launched.