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Hi @Jpbhasings as you confirmed that the internet speeds on the old phone is still better compared to the new phone after you updated the system (firmware/ software). It seems like the new firmware is causing the slow speeds over Wi-Fi. Something to do with your phone settings.
Would recommend to double check your phone settings specially Wi-Fi. You can uninstall all the app and then test it again to see if fixes it. If it does then it is one of the app else it is the phone firmware. In that case would recommend to contact HTC directly → here to assist you further.