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MBEDTLS ECDH is too slow, about 1500ms

Hi, all

I tested nRF5_SDK_17.0 ecdh example (path: \examples\crypto\nrf_crypto\ecdh), config with MBEDTLS, CC310, uECC separately and add a gpio toggle to measure timing.

the result is:

1>test ECDH with MBEDTLS: 1500ms 

2>test ECDH with CC310: 18ms 

3>test ECDH with uECC: 117ms 

It's too exaggerated that MBEDTLS comsume more than 1.5 second, can anyone give me some  explanation?

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