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What does 15x really mean? In-Memory sounds like MySQL's innodb_buffer_pool_size being set big enough with innodb_flush_log_at_trx_commit set to 0. MySQL 5.7 with some expensive off the shelf hardware can do over 1.5 million queries per second to the same table; this number is also kinda out there but at least it tells me some real numbers and explains how to replicate it (noted that this result is with the query cache disabled).

Due to all the performance improvements to MySQL we no longer need a key/value memcache like store, we just use the database; also did the same

This post makes some bold claims; please back them up with some real world comparisons :)