Size of Log File and response time

Size of Log File and response time

 

  

Hello,

I am having a problem with the size of my log file.
It is growing at a very high rate. The size of the data file is only 600MB where as the log file is at 6GB. please How can I restrict this size to minimum. and If I change the autogrow option, is it going to make some adverse affect on database. please help me. I have very sensitive data in my database. More over the users are also complaining that the response has also become slow. I have checked it . Is it because of the log file. How can I improve the response time
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