I've been running a web site (clevershark.com) on Wordpress since, well, forever. Recently for some reason I've been getting 100+ hits a day from China, mostly to the front page, from different users (according to my Jetpack stats).

Now, I use a caching plugin already (WP Fastest Cache) but when I monitor the mysql log -- which really only runs that one web site -- I'm still seeing TONS of traffic. If I use tail -f on the main mysql log it scrolls by way too fast for me to see anything. So I'm guessing that the caching plugin I'm using is not very effective. There just shouldn't be that many requests, or at least that's what I think.

So, what would be a better caching plugin for me to use? When I try to see the stats for my site I often get the "database connection error" message which would seem to indicate that the db engine is overwhelmed by the requests, forcing me to restart the mysql and apache daemons.

Am I interpreting this correctly? Does anyone have suggestions as to what I could do to remedy this problem?

Edit for more info: I am using wordfence, and it is blocking things like invalid login attempts. My Jetpack stats do show that almost all the requests are for the front page. I was thinking maybe someone is trying to figure out if I'm running an unpatched version of PHP (nope, I'm up to date), but it makes no sense for anyone to check this 100 times a day.