Déjà vu (seems I've seen this question before)?
Your burner is limited by the gas pressure. Should have a data tag listing the BTUs. Small ones seem to run maybe 6500 BTU. My indoor stove main burner is 9,000 BTU and non to fast boiling a big pot -- note this stove is also fed by low pressure gas. Beginning to see a trend? Those driven directly off 20# propane cylinders like you see at fairs and events can put out as much as 30,000 BTU!