Ethereum throughtput

[hknot]

Hi everyone,

What is the current throughtput of Ethereum, I found only a few articles which mention  15tps. is that correct ?

And my second question is. What Ethereum has already done for improving scalability ? I know that Sharding was implemented, is there anything else ?
I read something about Plasma and Raiden have it been implemented yet ? or those two are just proposals ?

Thank you very much for your help.