Bug | Warning | UserWarning: 1Torch was not compiled with flash attention

I installed Comfy UI, open it, load default Workflow, load a XL Model, then Start, then this warning appears.
It reduces my generation speed by tenfold.

got prompt
model_type EPS
adm 2816
Using pytorch attention in VAE
Working with z of shape (1, 4, 32, 32) = 4096 dimensions.
Using pytorch attention in VAE
clip missing: ['clip_l.logit_scale', 'clip_l.transformer.text_projection.weight']
clip unexpected: ['clip_l.transformer.text_model.embeddings.position_ids']
left over keys: dict_keys(['denoiser.sigmas'])
Requested to load SDXLClipModel
Loading 1 new model
C:\Users\nicol\Desktop\ComfyUI_windows_portable_nvidia_cu121_or_cpu\ComfyUI_windows_portable\ComfyUI\comfy\ldm\modules\attention.py:344: UserWarning: 1Torch was not compiled with flash attention. (Triggered internally at ..\aten\src\ATen\native\transformers\cuda\sdp_utils.cpp:263.)
out = torch.nn.functional.scaled_dot_product_attention(q, k, v, attn_mask=mask, dropout_p=0.0, is_causal=False)
Requested to load SDXL
Loading 1 new model