Please help form my PC and 2K15!

[introduzione]

Hi I have problems playing NBA2K15 Exibitions games.

My specs:
i5 760 @ 2.80 GhZ
RAM 4.00 GB
AMD Radeon HD 5700 - GDDR5 1 GB

The game slow down when the ball is in the paint.
Also with all the details at min and with a low resolutions. Nothing change.
The game is update.

BUT
If I play Blacktops 2vs2 or Shooting training with one player, the game goes fluent. No slow down.

Could you please help me?
Thanks!

[introduzione]

Please!!!

[TBM]

You have bad specs. Lower your settings.