run example for tvm complie tensorflow model， It's very slow

Questions
1

x86 cpu

WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.

WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.

WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.

WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.

WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.

WARNING:strategy:For x86 target, NCHW layout is recommended for conv2d.

run time:

tvm: 2.159142017364502

tvm: 2.1827878952026367

tvm: 2.186274528503418

tvm: 1.9802303314208984

tvm: 2.016192674636841

tvm: 2.0197951793670654

tvm: 1.995375156402588

tvm: 2.2087066173553467

tvm: 2.593811511993408

tvm: 2.403001070022583

African elephant, Loxodonta africana (score = 0.58335)

tusker (score = 0.33901)

Indian elephant, Elephas maximus (score = 0.02391)