...
To the right of the CPU and disk-full meters is a time, reported in ms. This time controls (but does NOT precisely present) the size of the buffer that Open Ephys GUI uses to process data. If you click on it, you can change this buffer size, which can either improve your overall processing load or make it faster (if more intense) for low-latency closed-loop work. There are more details at Acquisition board data latency .