System incredibly slow

System incredibly slow

I recently signed-up for professional edition of Zoho and as first step decided to do some customization. My experience has been extremely poor as for every update system goes to sleep. With "Loading" tag at the top for almost two minutes after each attempt to edit a field or save the change, I took hours to update only few fields before I gave up out of frustration.
Looking at Forum issues on slowness, I am seriously having a rethink whether I should spend my energies on customization to use Zoho or simply look for another vendor.
Please let me know if there is a solution to this problem or I should move my data elsewhere.