Possible Clues:

• Speed shown briefly by five in Rome?
• Distance travelled per unit time
• Speed of free love -- it's within the bounds of curiosity
• Agreeable — Riviera resort
• The rate of movement per unit of time
• Rate of motion per unit of time
• Rate terribly evil toy entertaining child at first
• Rate of motion, distance per unit of time
• Old king's caught up in pursuit -- performance I missed in 8
• Speed reached by the Spanish in very old metropolis