Regarding folder uploading performance within Internet Explorer
Can't upload the folders in OneDrive for Business on IE.(can upload on Google Chrome or others)
I would like to upload folders on IE because it is convenient if I could complete uploading
on IE in used for my own daily work.
Rozzini Kotsakis commented
I agree as IE is our default browser - it would be beneficial to have the function to upload a folder & it's contents to OneDrive online available for IE as well.
Office 365 Japan Support Team commented
I would like to share with you this comment about this continuous improvement has been requested by multiple user's continuously. If the default browser inside the company is IE, it takes a while to upload the folders besides using the Sync function.
Although I would not use the Sync function when uploading temporary folders, then it is preferable that [Open in Explorer] allows user's to upload folders directly, but it takes the time to open the file or does not open sometimes.
So that I also hope the feature will be implemented to upload the folders via IE.