Forum Discussion
Internet Explorer 11 performance with SPFx
Internet Explorer 11 is still the standard operating environment for many companies which makes the pages with multiple SPFx webparts really slow.
Each SPFx webpart by design adds at least 4 cached...
We are also seeing this issue and I set the blame on our Network group and must now humble myself. After networking at a SharePoint conference I found that many organizations are seeing inconsistent slowness with the IE browser. My organization had put in a ticket for this issue to Microsoft but all they wanted was fiddler traces which is hard to plan because this is so inconsistent. It seems this is another one of the "known issues" that Microsoft is not "transparent" about.
I have created an issue for this and hopefully , it get resolved soon
https://github.com/SharePoint/sp-dev-docs/issues/1438