streaming not working

Can somebody describe, why streaming is not working? The model provides the answer at once instead of streaming,

llm = Llama(
streaming=True,
model_path="/mistral-7b-chat-int8-v0.2.Q4_K_M.gguf",
n_ctx=32768,
n_threads=4,
n_gpu_layers=20,
callbacks=[StreamingStdOutCallbackHandler()],
verbose=True
)

generation_kwargs = {
"max_tokens": 20000,
"stop": [""],
"streaming": True,
"echo": False,
"top_k": 1
}

llm_response = llm(prompt, **generation_kwargs)

final_result = llm_response["choices"][0]["text"]

return final_result