Anyone else experiencing severe Timesheet latency when looking at a timesheet with lots of tasks / issues?

We've had an issue the last month with timesheets in the New Workfront Experience taking a long time to load and even making the browser unresponsive for several mins at times.

This seems to be isolated to timesheets with lots of tasks / issues listed.

I contacted Workfront support and they keep trying to pass the buck to my companies internal network team. Has anybody been experiencing a similar issue? I've contacted my internal network team a few times in the past already and they've stated that we're not blocking anything. Just want to see if anybody has experienced this and if there was a solution found.

Thanks