Mail Performance

Mail Performance

Hi,
 
I am using Zoho mail and am finding that I am having to wait 30-40 seconds for an email to open, even if it is an empty test email.
 
The message at the bottom of the screen is "Waiting for https://zmail.zoho.com/mail/popEmail.do....etc"
 
Can you tell me if something is wrong with my configuration? I really hope so because I get >100 emails a day and at this rate it would take more than 6 hours just to open them!
 
Any help is appreciated. I am in Canada and have the highest broadband speed available. The issue occurs on all of the PC's in my house (3) and other email services like Live and Gmail are very fast.
 
Regards,
Tony