Lynn perform very poorly at 30 speed compared to other 30 speed chars. At 100 speed, (skilled) lynn performs among the best among the cast. Getting that much speed is... not very reasonable for most players.
Meanwhile, arisha at 30 speed performs extremely well comapred to other chars at 30 speed. Ironically, a 100 speed arisha has one of the worst performance compared to other 100 speed chars.
Different characters scale up at vastly different rates with attack speed; causing character performance to range anywhere from subpar to OP relative to other characters, even if all other stats and player skill are identical.