I disagree, bitcoin can certainly be regulated.  You just watch.

As far as OP goes, when I sell something on Ebay I have immediate access to my money.  So that must vary among countries, and I'm sure if a bank or whatever decided to start using bitcoin as a currency, its use could be regulated just like this.  At least that's how I imagine it--and I'm not an economist or politician, so take my opinion for exactly how much you paid for it.

But fast or not it's relied on with the government guidelines, I don't think so because basically bitcoin is having a different system with PayPal maybe they will making different guidelines for bitcoin, and adjust to bitcoin.

Regulations will not make bitcoin slower unless the community vote to change some of the current rules via hark fork. Even the blocksize increase is still under discussion and no planned hard fork in the foreseeable future, I doubt we can change the bitcoin system so easily.

The government sure can "regulate" it. But regulation and control are two different animals. They can say "you cannot do this or that" but all they are doing is pushing it to the underground. The more they push it there the more will it be harder to regulate. The black market would welcome this with open arms. So the government better study it thoroughly before those clueless politicians make laws to "regulate" bitcoin.

as far as i know this rule was set because of the reversible transactions in paypal and banks so they hold the money for a period of time to prevent fraud,... and since bitcoin does not have reversibility i don't see why they should do this.

besides they are already having some sort of time when they waste like this when you deposit fiat in exchanges for example. but again it is fiat and they want to also check your identity.

Bitcoin can't be regulated and also if government try to regulate bitcoin exchanges/withdraw service than they can only have daily limit for both exchange/withdraw they can't fully track bitcoin source and have legal action.

since government can't regulate bitcoin but instead they can only regulate the businesses using bitcoin then if the slow you say happens (which i don't think is the case because of how bitcoin works) only those services will be slowed not bitcoin. so stop using those services.

It will become slower if the regulation is being hold by the government as they are always finding way to reveal your identity,at some point they are just about your security. But if its some private/public community handling the regulation I think it will not slow down as the progress of evolving/enhancing the speed of transactions are limitless and cannot be mandated by the government.

I think holding of funds might be country specific but there is no doubt that plenty of things that we currently take for granted are going to change if Bitcoin gets regulated. There is nothing to be done about this, if we want to go mainstream, we'll need to make concessions.