I'm sorry, 135 is playable (if consistent). Also, it's likely not riot's fault. There was a vulnerability in all the PCs that just got patched, but it was one that increased performance speed on PC based servers. So with the patch to Windows, all the servers everywhere got a lot slower because the patch had to role out early before it was optimized because someone leaked the vulnerability.
And that is why the servers are probs slow. Because people with the right bot, know-how, or both could access some or all the information PC servers keep super-encrypted without proper auth. Would you rather have 100 extra ping or debt for the beach house in mali a hack bought using your credit card?
They're probably working on something to fix it, but my understanding is it's not really riot's ball.