Really slow when using Audio reference tab

[Carlsans]

Using Firefox, I closed all the windows (by the way they should be closed by default or one button to close them all) except for keyframe grid and audio reference. I try to set up keyframes for a 7 minute song that totalize 5700 frame. The latency when I push for example the play button is about 1 second. That make it difficult to adequately place the keyframes. I really like parseq but the optimization issues are a big problem that render the whole project much less interesting. Is there any way I could speed that up ? Thanks.