If you filter events from the view via the filter menu, the "width" of the flame graph view stays the same, and the percentages of the items also don't change, even though some events have been removed. This is inconsistent to what the statistics view does and if only few items remain, they become hard to read. Furthermore, the cutoff for small events also stays the same, and equal events from different parents that end up on the same level after removing the parents aren't grouped together.