It currently filters out items <15ms. In many contexts these days, this quantity is too high and filters out 11ms paint times that are worth targeting. One possibility is to more smartly filter out "small" times relative to the average/median times recorded.. though I think we could remove this filtering behavior..
Currently filter has 3 options: >= 1ms, >= 15ms, all records. We could add couple more, make them adaptive or make length adjustable with some logarithmic slider.
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.