Here are exact changes in ships' speed for that patch:
Viking: 200 => 150
Small cargo: 600/1200 => 500/1000
Large cargo: 300 => 250
Fighter: 1000 => 800
Stealth fighter: 700 => 600
Cruiser: 500 => 400
Battleship: 400 => 350
Broodling: 2500 => 2000
Fastling: 1000 => 900
Scavenger: 800 => 700
Mudkip: 1000 => 800
Dreadlisk: 350 => 400
Hope it helps.