Symmetric cipher speed (AES vs Camellia vs Twofish) If I have understood correctly, Twofish is more secure (harder to break) than AES and Camellia, but it's slower than both.

How can I measure the speed difference between AES vs Twofish and Camellia vs Twofish? Does Twofish use twice as much time? Half as much time? Or does it just take a few percent longer to encrypt/decrypt than AES/Camellia?

I'm in the starting/planning phase of software development: the local stored data will be encrypted, and the data to be transmitted over a network will be encrypted/signed. I would like to use Twofish as the symmetric cipher, but if it uses twice the resources of AES/Camellia, then it's not a good idea.
Just use AES. It's hardware-accelerated and implementations have had ages to have flaws discovered and patched. More strongly, just use GPG to encrypt data at rest and just use TLS (>= 1.2, with appropriate AEAD ciphers) for data in motion. "If you're typing the letters A-E-S into your code, you're doing it wrong."

Anything you build yourself is infinitely more likely to be broken as a result of your design choices than by your choice of cipher.