Hi Sudeep,
Thanks for posting on our forum.
I suggest you try safe mode to check the result:
Open Office apps in safe mode on a Windows PC
Besides, I have searched this, you can refer to the following article:
Excel performance: Improving calculation performance
If it is still slow for calculating, I want to collect the following information for further analysis:
- The version of Office. (Click File>select Account)
- Check if you can use the files normally before? Which operation have you taken before the issue occurred, such as updating Office?
- The affected file. I want to collect the file to test on our side to check it is related to file or Excel.
To protect your privacy, I've sent you a private message to collect the information. You can access it via private message.
Thanks,
Qing