It's not completely negligible--even if CPU usage is negligible, it does add latency during SSL negotiation that might be unpreferable for some apps. The testi

It's not completely negligible--even if CPU usage is negligible, it does add latency during SSL negotiation that might be unpreferable for some apps. The testing burden is a lot higher because one wrong link to http:// http:// in CSS, HTML, or AJAX will cause big scary messages. And there is the IP address problem, you can't vhost as most people with Apache like to do.