LBR20 LTE slow performance with IOS devices

I rencently switched the Orbi Router in our home network from an Orbi RBR40 to the Orbi LBR20 LTE router.  We live in a rural area with not hard wired internet options so we use LTE internet provider.  Our previous network set up used a mofi LTE router as an access point and it was connected via ethernet cable to the Orbi RBR40 with 3 orbi satelites.  We have 3 iphone 12's, 2 Mac Book Pro's, Apple TV ios devices and I have a Dell Lap top issued by my company I use for work.  All of our devices worked fine on the previous home network system but research told me that the new Orbi LBR20 LTE router would increase our internet speeds over the mofi router.  I ordered one and have found that the speed with the Orbi LBR20LTE router is 3 times faster than the mofi router was.  The speedtest shows the speed is so much better and my lap top is much faster.  The issue I have is all of our IOS devices are very slow.  Web pages take a long time to open and overall performance is much slower than previously.  Again, my lap top is much faster so I am certain it is an IOS to Orbi issue.

Does anyone have any helpful tips to increase performance of IOS devices with Orbi router?

Thanks in Advance.