In the Search panel, if you use the Tab key to tab down to the Type drop down box, it does not respond to the up-down keys, unless you click it with the mouse first.
It seems to happen only in a newly opened search panel, after you have clicked it with the moust once, it seems to work allright for the rest of the time that panel is open.
OK. It seems a bit slow sometimes so I thought it might be another language. But of course, it must be pretty complex under the hood so that will of course have an impact on the speed.