I am facing an issue with wifi on a Bold 9700 running OS v5.0.0.743. 

I have installed an application on a Blackberry 8520 running OS v5.0.0.68 and on a Bold 9700 with OS v5.0.0.743. When I run the app with wifi, I notice that the response from the server comes quickly on the 8520 but the Bold 9700 lags by around 8 seconds. 

I have searched for this issue and found out that there is some problem with wifi on the 9700. 
Can this issue be solved by an OS upgrade of the 9700?