Orders - So Many Variables

This is more or less a rant. But I can’t seem to figure it out. For example Wednesday will have X orders then Friday only 10% of that. Granted we make changes to the site every day so it’s hard to track why.

It just seems like it shouldn’t be that variable. Test orders are made at least twice a day just to make sure nothing is wrong (especially with the cart or checkout page). Also standardized tests in 1024 res /IE.

There is some correlation to traffic. But there have been days with high traffic (For us would be ~300 unique visitors.)

Is there a gremlin in the site engine that I’m just missing here? Please share your experiences, and also if you think the economy lately has had an effect on your traffic/orders.