Hello,
Please make sure you are NOT using Cloud-dials page as your homepage - instead set it up using the proper add-on URL. Just follow the steps written in Options page / first tab / first line.
The Cloud-dials web-page (https://group-speed-dial.fastaddons.com/dials) is meant to be used on unsupported browsers or in your phone.
If you setup homepage using the steps in Options page, you should get proper fast responses.
If opening new tab with dials takes more than half a second, something is wrong.

Please let me know to my support e-mail if you have more issues.

Have a nice day :)

Best regards,

Juraj Mäsiar