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Why does single threaded make it slow?

Also, 3.0 has a better LRU algorithm. https://redis.io/topics/lru-cache

A lot of uses of Redis are suboptimal, but easy to set up and good enough. For example, "true" LRU is not always needed -- an approximation of LRU is sometimes sufficient. It's often not worth the time and money to do better.

When you need to scale past what Redis can provide, you can move on to a different solution, as Github has done.

What should people use?

Memcached is a LRU cache.

I went and searched for memcached redis because up until now I haven't gotten around to checking out the differences. Here are some things I found.

http://antirez.com/news/94

http://stackoverflow.com/questions/10558465/memcached-vs-red...

http://www.infoworld.com/article/3063161/application-develop...

use Redis when you need advanced data structures built in. Memcached is just a KV store.