Order entry forex rates information

The table of current Forex cross rates seems to freeze a little while after an initial trade is submitted. Is this possibly a’connectivity ’ problem at my end or is there some way of gettig the rate information refreshed on demand, other than signing out and signing in again. If what happens is intentional so as to minimise use of bandwidth,or whatever, have you any recommendation for a ) a respected source of running market rate information - I appreciate that there is of course no single source which one could prove was the ‘best’ in the field. - and b) one which would be suitable for API access (this may be the same as a.).