Thanks for all your advise guys but I think I don't explain correctly the question, I'm concern with the integrity of my wallet password or some kind of middle man attack or that kind of stuff  by the company who manege the proxy (although is manege by the only communication company in the country).
In concern with the internet speed its impossible upgrade it for my, it cost 30USD 30hours at 1mb/s, I think its the world most expensive Internet actually but that is not the point. I already downloaded and installed the Electrum wallet and its a charm with my speed connection (I need to use the VPN because only accepts SOCKS 4 and 5 proxy and mine is HTTP)