Static movement rates that are a holdover from wargaming:
Reynard the Nimble STR 10, DEX 16, CON 12 rogue? 30-ft. movement.
Maximus the powerful, strong and coordinated, mighty-thewed physical paragon STR 18, DEX 18, CON 18 fighter? 30-ft. movement.
Herbert the Unremarkable NPC with STR, DEX...