The original key length is 1024 bit. However, mac/iOS does not accept the length, so we must sign the certificate with 2048 bit.
In the latest firmware, we issue the certificate with RSA key 2048 bits.
It takes more time to sign a certificate and validate a certificate with 2048 bits than 1024 bits.
It affects the access of a new HTTPS site at first time.
We are now working on the improvement.
Any news ?
The improvement of the feature is on the roadmap and it will be implemented in the future release.