Hi, we are currently running 4.0.3 (soon to upgrade to the latest version) and recently we noticed that payments to Paypal are VERY slow.
We use Paypal Pro for credit card processing as well as the Express Checkout. If a customer pays by credit card, they wait on average around 25 seconds for payment to complete. Recently, we had a sale and the problem was worse; roughly 10 incomplete orders for every successful one.
I have been in touch with our hosting provider, our server is fine - its a dedicated box with 16gb of ram only running the one website. I even contacted Paypal and they cannot see an issue.
So, I'm wondering if anyone else has experienced this problem during busy times? I'm really hoping the problem will go away when we upgrade, as I don't want to think about how many sales and customers I have lost.