[techie128]

Try inserting more that 30K elements in a key which is a sorted set and watch the insertion time, memory & cpu usage. Now try doing this to millions of keys simultaneously.

[darkr]

We run several million sorted sets, but they are all short sets (100s), but do thousands of writes/sorts per second without issue.

From memory - there was a setting to turn on/off gzip compression for a list once it went beyond a certain size - do you have this enabled?