brand new Insperion 5500 with a qualcomm qca9377 only getting download speeds of about 25mbps.  Have a mac hardwired to network getting 330mbps, as second wireless mac is getting 110mbps, an older HP windows machine is getting 100mbps.  but this brand new dell is only getting 25mbps.  I've tried everything.  Unplugged and reset everything.  Shutdown antivirus and firewalls.  updated adapter driver. Ran Network Troubleshooter. Pinged the Default Gateway. Reset the TCP/IP stack.  Released and renewed the IP address. Flushed and reset the DNS client resolve cache.Nothing helps.  Any suggestions?  I'm connected to an Orbi AC3000 which is wired to a Time Warner Cable modem.  This is only this one device having problems.