I didn't spend too much time on this example optimizing for performance(Mostly just making sure it's readable and easy to understand) other than making sure it was close to the maximum, realistically you should always send the largest amount thats possible given your memory constraints. As I...

There are no restrictions on speed for trial accounts. Since you are on ADSL2+ I'm going to assume its something in the range of 20Mb down and 1.3Mb up and perhaps in the UK (Most likely BT?) The use of the SOAP interface incurs quite a bit of overhead for a few reasons, first its doing base64 encoding...