Thanks to everyone for your support, I got a solution. I opened the report and Surpress fields one by one and found that the fields that have The Times New Roman font create a problem.
Since the font "The Times New Roman" is already installed on Windows 2012.
Then we copied the font "The Times New Roman" from the local Windows 7 and copied it to Windows Server 2012 and restarted the machine and now its performance.
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