Hello,
I am surprised there is nothing in the Knowledge Base and nothing in this Forum about Redis? Redis is a very attractive cache for PHP applications because it is server based as opposed to local file/memory based and it is well supported. The Wordpress plugin that makes use of Redis is wp-redis.
The question is how does Redis interact with Comet Cache? Are the two products compatible in any way? If not, I will replace Comet Cache with Redis.