This lesson explains how buffer size directly affects latency and performance when recording and mixing in FL Studio. Students learn how to adjust buffer length to minimize delay when recording MIDI, vocals, or instruments, and when to increase it for stable playback during mixing sessions. The lesson covers practical guidelines for balancing latency and CPU load, recognizing issues like crackling or glitches, and adapting settings based on different audio interfaces and computer performance. By the end, students will understand when to use low or high buffer settings and how to quickly adjust them for different stages of production.