[Plugin: DB Cache] Does it work in 2.84?

I cannot seem to figure out if db-cache is working on wordpress 2.84. The problem is that in the source it says db cache has cached it but I do not see any files or even the directory wp-content/tmp or the file db.php. Also the queries does not seem to be reduced as I have a footer that displays load speed and queries.

Thanks for any info.