Email client delays downloading messages

Getting email client was a long waited thing. So finally it has arrived but left me disappointed a bit.
There is 10 minutes delay to get POP messages to the playbook. When I send a message to myself for example, my PC email client gets it from the server in a second or two, but the PB client needs about 10 minutes to get the message.
This is not related to the "sync interval" setting which I did put on minimum ( 5 min ). Regardless of this setting, by pulling messages list down, the "refreshing" text shows up and should download them immediately.
Thanks for help

Spent in total about an hour with the RIM second level tech support on couple of occasions regarding this.
Was told at the end this is an issue between RIM playbook and Shaw Cable POP servers only.
They've mentioned it is something that would be fixed in the next OS update.