End Users Reporting That Report Viewing Is Now Slow

Hi
Has anyone else experienced greater lag when opening BI reports lately?  These are the same BI reports that are used daily for past few years and now on service every report seems to have alot of lag when opening to view.
Not sure if this is on our company's end or if this is a Microsoft issue.
Some reports now open faster via the Power BI Mobile app.  Some Dashboard take awhile to load whereas on the mobile app it is instant.  Just curious