If you've got a specific site that this reproduces on that would be helpful. If you can also provide the model of the monitor you're using and the version of your OS that would help us track it down. Thanks!
This is with fully clean install and several attempts at cleaning profile. I notice it seems to get stuck on "waiting for site" and "Performing TLS Handshake", which is strange because im on a 100gbit line and I can get chrome to load those sites full speed just fine simultaneously.
X1 Carbon Fedora 26 Intel Core i7-6600U 16 GB RAM
Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)
Do you have a good place to send these profile dumps to?
Posting the videos of Chrome vs Firefox Quantum somewhere like YouTube might be an interesting thing to watch.
How'd you get a 100 GbE NIC in that X1 Carbon!? :)
My situation is the opposite: workstation with a 10gbe connection the the corporate lan but upstream is capped to 2gbe.