Here are two screen shots. One is with Weighted averaging ON the other is with weighted averaging OFF. Certainly this is a very rapidly pulsing source!
My guess is that it is Over the Horizon Radar of some sort, but it is wiping out a full 20 KHz of 15 meter phone.
I have seen youtube videos from the hack rf folks where they submit either screen shots or files of emitters and a web based database will define the transmission. Kinda slick but like most things on the interwebby there is no certification required for the trustworthiness of the database.
I too was recently playing with display settings and was wondering while doing so if settings that require more compute power can result in a loss of receive data no matter how small. Low data rate transmission probably not a concern but high data rate precise transmissions (ie psk 500, 1000 for lack of a better example) may be a concern. Just do not know enough about it yet but learning.
WRT the other stuff, I like the positives that all my radios offer. My flex 6300 however is w/ doubt hands down goto rig for all areas of operating. It is not chest thumping just reality.