I just moved to a new dedicated server and I'm running into the following issue.
I need to email 8000 of my users using the basic PHP mail function - nothing fancy, it's HTML-formatted but it's just text, no images or other content.
On the previous server, which was a VPS with 1/4 of this server's RAM, I could send the emails 2000 at a time with very little lag on the site as a result.
However, on this server even sending 50 emails gets the CPU usage up to about 40% and lags the entire site considerably. Here is a Putty screenshot, I was wondering if someone has an idea what could be wrong here:
It's a CentOS/Apache dedicated server, 8GB of RAM, and the CPU is:
Intel® Xeon® E3-1230v2 3.3GHz 8MB Cache Turbo Quad Core /8T
It really doesn't look like it should have a problem with such a simple task, right?