Problems with specific on planet story cutscenes

Hi,

My current version of the Star Control Origins game is constantly lagging when there is a story line where the science officer is speaking. For example, at a Lexites facility. The game is unresponsive between sentences for about a minute, so it takes approximately 5-10 minutes to get through those cutscenes.

Could you give me some help on figuring out what is different in those instances and how could I solve the problem so that the game runs smoothly?

Thank you for your help,
Regards,
Attila