While FMI mentioned that they improved the WAN performance of WebDirect and Richard Carlton demonstrated speed improvement with FMP I had assumed that you would require an FM15 server to benefit from the improvements.
However, I was delighted to find out today that that isn't necessarily the case.
I opened a remotely hosted solution (FMS 14) that was very badly written, about 850MB, with hundreds of tables and TOCs and saw a huge improvement.
I compared switching to a heavy layout on the same server at the same time between 14 and 15. FMP 15 switched in 2 seconds while 14 took about 1 minute.
It looks to me like the more the solution is complex the bigger the gain will be.
I would be interested to hear about others experiences so far...
Maybe someone has already done a scientific comparison?