Not a ready implementation yet but the mimblewimble protocol solves a lot of the scalability issues plagued in other blockchains.

https://scalingbitcoin.org/papers/mimblewimble.pdf
https://github.com/ignopeverell/grin/blob/master/doc/intro.md


-------- Original Message --------
Subject: Re: Are cryptocurrencies ready to handle large number of transactions?
Local Time: December 25, 2017 3:08 PM
UTC Time: December 25, 2017 2:08 PM
From: gmkarl@gmail.com
To: Georgi Guninski <guninski@guninski.com>
cypherpunks@lists.cpunks.org


On Mon, Dec 25, 2017 at 8:17 AM Georgi Guninski <guninski@guninski.com> wrote:

Which cryptocurrencies are ready for large scale?
Searching the interwebs and chat suggest decentralized solution will be
extremely difficult if possible at all.

I used google and found these.

LN support earlier this year: https://bitcointalk.org/index.php?topic=1891745.0 (groestlcoin, syscoin, planned litecoin, decred, viacoin)
Discussion: https://bitcointalk.org/index.php?topic=1847410.0 (ardor, iota, bottom of first page)