Application runs with different speed for two different user logins on windows server

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http://serverfault.com – am so confused about this thing.We have a application in windows server that download data from SQL server and store in our local machine.Now the problem i have is my windows server has two logins and in one login the app runs real slow like gets 1 row in a minute and from another login it fetches 20 row in a minute.We have this problem only from a last couple of days.What could have caused this .Please help. More details: SQL server:SQL server2008 Os:windows server 2008 Access method:Remote connection. Application: Custom .Net application to get data Both accounts are limited right ac (HowTos)