If not - Start a website test today. And when you do - Pay attention to uptime vs. response time.
Many simple web performance monitoring services will only give you uptime - is your site up or down? More difficult, but more important, is the response time. Maybe your site is up, but what is your website speed? And how fast is the load time compared to the last day, last week or last month?
Apica WebPerformance monitoring service is the complete website performance test tool you need to answer these questions and help you stay on top of your web performance.