I have a big shiny app runs very weill locally in all browsers, but when I deploy it to the shinyapps.io it runs very slow in IE11!

Hi!

I have a big app that uploads a files which has thousands of genes and then plots them. The app works very well locally in all of the browsers, but when I deploy it to the shinyapps.io it runs very slowly in IE11. The page takes few seconds to load and there is latency in render functions. This is not the same case in chrome. In chrome the app works well locally and when deploying it too! I want to make my app run better in IE11 when deploying it, how can I do that? What are the reasons behind the loading page latency in IE11?
(Throughout the developer tools of IE11 I saw that it takes around a minute to read the huge file of genes, but that is not the same case in chrome, that is why is so confusing!)

Thank you for your support!
Please I need some advice as I have to solve this problem!
Best Regards,
Karni