Timing estimates for U85

I have a quantized network in tflite format which I pass to the vela compiler. If I select U55-256, I get a timing estimate of 1.81ms. If I select U65-512, I get 0.9ms. However, if I select U85-2048, I get a timing estimate of 18ms. Is the timing estimate of the U85 not yet running properly? Is this part of the reason the timing estimates are now hidden behind a flag?