You're stretching it. Actually yes, look at the economic growth of China vs that of the Philppines, an elected democracy. Or African or Latin American Democracies. Democracy need not alway lead to the best solution. Even western democracies had strong central governments and tight control laws before the liberalised.
Philippines under Marcos has a strong central govt. What happened to Philippines under its 30 years rule? Corruption and poverty were the end results. Other African and Latin American countries didn't fare any better under iron fisted rulers either. Their countries were already in a mess when they switched to the democratic model of government, without strong democratic institutions. Indonesia is a case nearer to home.
China has a long tradition of dynastic rule. How long did all these dynasties last before degenerating into chaos? The Qing dynasty lasted not more than 300years. Before Qing dynasty collapsed, rampant corruptions and abuses of power already set in after the first 100 years of rule. Modern China only started to open up in 1978 and it still has some way to go before it reaches its first 100 years. It's still early days yet to say whether the current political structures in China can support its economic liberalisation in the next 50 years of development. The verdict is still out.
The relevant question for S'pore is whether the conditions are riped for Singapore to practice a more open democracy like Britain or Amerca.