mb51 trx (movement type 101) ->Doc info->FI Doçuments takes ages

Hello

We are experienceing performance problem when accessing FI document (FB03) from MM document.

in praxis this means when choosing an todays document in mb51 trx (movement type 101) ->Doc info->FI Doçuments

it takes ages to get FI document

Does anyone has idea how to make system faster in this regards

Thank you in advance