For Blue channel measurements, there is an option to display the frames from which the blue channel data is collected.
When the checkbox for this option is checked then the blue channel frames are shown but for CooRecorder 7.7 it also makes the screen updates go slow as described above!
This "feature" was originally introduced for experimentation during program development but was then forgotten. This has been corrected from CooRecorder version 7.8
So if you are tormented by slow screen updates in CooRecorder 7.7, it might be because this checkbox is checked! If you are not doing blue channel
measurements, just see that the box gets unchecked. If you want to do blue channel measurements but suffer of slow and jerky screen updates, you might
consider to contact me to try the current 7.8 TEST system (if the regular 7.8 system has not been released when you read this).
Though if you have a too big file and want to anyhow open it on a system running CooRecorder 7.7, then you might check this box to enable "bigger file handling".
But do not forget to uncheck the box when you are ready with that big file!