There are three different text speed settings in Iron Marines Invasion: slow, normal, and fast. If you feel the cutscene text is not working for you, you can change it following these steps. 

To change the cutscene text speed

From the Map, go to the Settings menu by tapping on the gear icon on the bottom left. 

On the top right, find the Text Speed settings. It will display your current text speed.

Tap it repeatedly to change your text speed settings. 

Hit DONE and wait for the next cutscene!