Frigate detection works with snapshots, not with recording

Tried to replace Blue Iris with Frigate, but seems I can’t do it yet. I have both running in same PC currently. Blue Iris records when detects movement. Frigate add-on detects persons and cars and saves snapshots.

But when I try to record with Frigate it seems to outrun the computation power of my PC, even when Blue Iris is not on. I would buy Corale USB stick if it would be possible to buy one. But I don’t get it why my PC is not good enough when Frigate tries to record video but is good enough for detecting persons and cars? Or is it doable without Corale and I just have wrong configuration? Is it possible to trigger basic recording without detection when detection is made and stop detection for a while?