Video that interacts with sales pages... killer creative examples

It depends...

If you are an optimization expert you can make ANY video load in as little as 1 second.

So there is no generalization. It all depends on the publisher and whether they understand and implement optimization.

For example I teach that ANYONE who uses these type of effects should take special care to optimize the video encoding so that the video is under 256kbps which is the average slowest broadband speed in rural US.

If you optimize your video bit rate to be lower than the bit rate of your slowest average visitor then you can set your buffer and load time to as little as 1 second. My rule of thumb is setting it to 3 seconds or less.

By using videos that are small dimensions you can get away with encoding at lower bit rates...

My most successful "wow" factor video is encoded at a miraculous 72kbps total! The site it is on has generated almost a half million in $27 and $37 sales (not counting back end purchases) and has converted at an average of 7%+ for three years.

Many factors such as fluxuations in your connection, whether you are on a shared Cable network, etc. and where the publisher is hosting the video can also effect load times.

I do not experience the delay that you describe on those examples...

But then I have not checked to see if they employ the optimization principles that are so important.

In fact Optimization is the one principle that ANYONE can use on ANY video to instantly boost response and conversion rates regardless of content.

Just like back in the days of dialup where image optimization was taught in colleges, website and video optimization is integral to boosting direct response results.

Besides bit rate optimization you can also optimize delivery by hosting on many of the top tier CDNs.