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These wallets are downloading the blockchain info, it's many GB. It's unecessary for ether. There are wallets like Exodus that don't need to sync with the blockchain. About sia wallet I also tryed two times to download but gave me an error on 80% or 90%. I posted some info on wallets this link https://steemit.com/cryptocurrency/@dralex/practical-desktop-wallets

Alright, thanks for the reply! Living in Belgium where data limits are still a thing doesn't help with the speed either I guess.