Speedbrake Lever,
Emirates get priority - not in my five and a half years in Dubai. Perhaps a perception at certain times due to the number of Emirates start-ups and departures, but intentionally NO, deifinitely not! (In fact the converse may be true with some of the ATCOs.)
Speed restrictions are published in the Jepp as well as the UAE AIP (also found in the ICAO proceedures for type "C" airspace).
The guys in DXB do a great job under (at times) extremely trying circumstances. Next time you pass through DXB perhaps a visit to the Approach room and a chat would help you understand, and you would be less critical.
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My views are personal and DEFINITELY don't reflect those of my employer!