Whats the point of offline mode in zoho mail if you cant load the page without being onine?

I have been using zoho mail since 2017. Never had an issue until recently. The last few weeks have been painfully slow just to open zoho mail. It sometimes takes several minutes just to open the zoho mail website. Then loading a single email can take several minutes. After doing some research it seems offline mode is a good fix or using the desktop lite app in offline mode since it stores emails locally and you dont need to connect to the zoho server. The catch is that at least for me you still need to be connected to the internet and connect to zoho to just open the site even when offline mode is enabled. That doesnt make sense. Zoho support just isnt much help. I already told them I tried different broswers, clearing cache/data and tried totally different computers and their response was to try clearing cache and try another browser lol. They didnt even read my email and they wont respond when I told them I already did this.