Performance of BO 3.1 is slow compared to XIR2

Hello,

We are planning to upgrade our xir2 environment to 3.1.

I installed BO 3.1 on the same server where XIR2 is working. All the miration was successful but the problem is when I run the reports I see that the time taken to run the report in 3.1 is too long compared to xir2.

Can anyone suggest me some tips to improve the performance of BO 3.1

Thanks in Advance.