Quote from: Charles-Tim on Today at 12:47:25 AM

the results are still around 52% reduction. I hope I am correct.

The best you can reach is around a 54% reduction. A P2PKH input is 148 vbytes, while a P2WPKH input is 68 vbytes, for a difference of 80 vbytes. 80/148 = 0.54. There are of course other differences between the size of outputs and the size of the transaction header, but these are very small compared to the size of inputs.

Quote from: SquirrelJulietGarden on Today at 01:50:24 AM

- With a same seed, you can create two types of addresses in Electrum: Legacy and Segwit.

You will need different seed phrases to do this. Unlike BIP39 seed phrases, Electrum seed phrases have a version byte built in to them, which specifies whether the seed phrase will generate a Legacy wallet or a Segwit wallet.